diff --git a/Cargo.lock b/Cargo.lock
index 8b5c16c1..105472dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -181,10 +181,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "clicolors-control 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -205,10 +205,10 @@ dependencies = [
 
 [[package]]
 name = "curl"
-version = "0.4.18"
+version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "curl-sys 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -220,7 +220,7 @@ dependencies = [
 
 [[package]]
 name = "curl-sys"
-version = "0.4.13"
+version = "0.4.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -264,15 +264,15 @@ name = "failure_derive"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "filetime"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -389,11 +389,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "libc"
@@ -493,7 +490,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -528,7 +525,7 @@ name = "os_type"
 version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -572,7 +569,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.20"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -580,10 +577,10 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "0.6.9"
+version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -659,12 +656,12 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.0.5"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -679,7 +676,7 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ucd-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -716,7 +713,7 @@ name = "schannel"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -754,8 +751,8 @@ name = "serde_derive"
 version = "1.0.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -845,8 +842,8 @@ version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "heck 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -855,8 +852,8 @@ name = "syn"
 version = "0.15.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -865,8 +862,8 @@ name = "synstructure"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -878,10 +875,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "tar"
-version = "0.4.17"
+version = "0.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "filetime 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -957,7 +954,7 @@ name = "thread_local"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1050,7 +1047,7 @@ dependencies = [
  "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "human-panic 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "indicatif 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.10.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1070,13 +1067,13 @@ dependencies = [
 name = "wasm-pack-binary-install"
 version = "0.1.0"
 dependencies = [
- "curl 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "zip 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1171,13 +1168,13 @@ dependencies = [
 "checksum console 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd48adf136733979b49e15bc3b4c43cc0d3c85ece7bd08e6daa414c6fcb13e6"
 "checksum constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8ff012e225ce166d4422e0e78419d901719760f62ae2b7969ca6b564d1b54a9e"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
-"checksum curl 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)" = "a9e5285b49b44401518c947d3b808d14d99a538a6c9ffb3ec0205c11f9fc4389"
-"checksum curl-sys 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)" = "08459503c415173da1ce6b41036a37b8bfdd86af46d45abb9964d4c61fe670ef"
+"checksum curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)" = "c7c9d851c825e0c033979d4516c9173bc19a78a96eb4d6ae51d4045440eafa16"
+"checksum curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)" = "721c204978be2143fab0a84b708c49d79d1f6100b8785610f456043a90708870"
 "checksum dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "88972de891f6118092b643d85a0b28e0678e0f948d7f879aa32f2d5aafe97d2a"
 "checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
 "checksum failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6dd377bcc1b1b7ce911967e3ec24fa19c3224394ec05b54aa7b083d498341ac7"
 "checksum failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "64c2d913fe8ed3b6c6518eedf4538255b989945c14c2a7d5cbff62a5e2120596"
-"checksum filetime 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "da4b9849e77b13195302c174324b5ba73eec9b236b24c221a61000daefb95c5f"
+"checksum filetime 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6f57e64bf5eae62efd4efed005ae81a7115012a61f522bba54542e1a556af921"
 "checksum flate2 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3b0c7353385f92079524de3b7116cf99d73947c08a7472774e9b3b04bff3b901"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
@@ -1191,7 +1188,7 @@ dependencies = [
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
-"checksum lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca488b89a5657b0a2ecd45b95609b3e848cf1755da332a0da46e2b2b1cb371a7"
+"checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
 "checksum libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)" = "76e3a3ef172f1a0b9a9ff0dd1491ae5e6c948b94479a3021819ba7d860c8645d"
 "checksum libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
 "checksum lock_api 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "775751a3e69bde4df9b38dd00a1b5d6ac13791e4223d4a0506577f0dd27cfb7a"
@@ -1213,8 +1210,8 @@ dependencies = [
 "checksum parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ad7f7e6ebdc79edff6fdcb87a55b620174f7a989e3eb31b65231f4af57f00b8c"
 "checksum pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "676e8eb2b1b4c9043511a9b7bea0915320d7e502b0a079fb03f9635a5252b18c"
 "checksum podio 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "780fb4b6698bbf9cf2444ea5d22411cef2953f0824b98f33cf454ec5615645bd"
-"checksum proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)" = "3d7b7eaaa90b4a90a932a9ea6666c95a389e424eff347f0f793979289429feee"
-"checksum quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "63b5829244f52738cfee93b3a165c1911388675be000c888d2fae620dee8fa5b"
+"checksum proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)" = "ab2fc21ba78ac73e4ff6b3818ece00be4e175ffbef4d0a717d978b48b24150c4"
+"checksum quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "53fa22a1994bd0f9372d7a816207d8a2677ad0325b073f5c5332760f0fb62b5c"
 "checksum rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8356f47b32624fef5b3301c1be97e5944ecdd595409cc5da11d05f211db6cfbd"
 "checksum rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e464cd887e869cddcae8792a4ee31d23c7edd516700695608f5b98c67ee0131c"
 "checksum rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1961a422c4d189dfb50ffa9320bf1f2a9bd54ecb92792fb9477f99a1045f3372"
@@ -1223,9 +1220,9 @@ dependencies = [
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum redox_users 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "214a97e49be64fd2c86f568dd0cb2c757d2cc53de95b273b6ad0a1c908482f26"
 "checksum regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9329abc99e39129fcceabd24cf5d85b4671ef7c29c50e972bc5afe32438ec384"
-"checksum regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "2069749032ea3ec200ca51e4a31df41759190a88edca0d2d86ee8bedf7073341"
+"checksum regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ee84f70c8c08744ea9641a731c7fadb475bf2ecc52d7f627feb833e0b3990467"
 "checksum regex-syntax 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "7d707a4fa2637f2dca2ef9fd02225ec7661fe01a53623c1e6515b6916511f7a7"
-"checksum regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "747ba3b235651f6e2f67dfa8bcdcd073ddb7c243cb21c442fc12395dfcac212d"
+"checksum regex-syntax 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fbc557aac2b708fe84121caf261346cc2eed71978024337e42eb46b8a252ac6e"
 "checksum remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3488ba1b9a2084d38645c4c08276a1752dcbf2c7130d74f1569681ad5d2799c5"
 "checksum rustc-demangle 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "bcfe5b13211b4d78e5c2cadfebd7769197d95c639c35a50057eb4c05de811395"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
@@ -1251,7 +1248,7 @@ dependencies = [
 "checksum syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)" = "90c39a061e2f412a9f869540471ab679e85e50c6b05604daf28bc3060f75c430"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
-"checksum tar 0.4.17 (registry+https://github.com/rust-lang/crates.io-index)" = "83b0d14b53dbfd62681933fadd651e815f99e6084b649e049ab99296e05ab3de"
+"checksum tar 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)" = "89b518542272d9c12195e72885c7a4c142b89226f681bb129e4a922ba1b1ee74"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "55c1195ef8513f3273d55ff59fe5da6940287a0d7a98331254397f464833675b"
 "checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"
diff --git a/docs/src/SUMMARY.md b/docs/src/SUMMARY.md
index 69795d3b..8471174f 100644
--- a/docs/src/SUMMARY.md
+++ b/docs/src/SUMMARY.md
@@ -18,4 +18,5 @@
     - [`src/utils.rs`](./tutorial/template-deep-dive/src-utils-rs.md)
   - [Packaging and Publishing](./tutorial/packaging-and-publishing.md)
   - [Using your Library](./tutorial/using-your-library.md)
+- [`Cargo.toml` Configuration](./cargo-toml-configuration.md)
 - [Contributing](./contributing.md)
diff --git a/docs/src/cargo-toml-configuration.md b/docs/src/cargo-toml-configuration.md
new file mode 100644
index 00000000..5515ecb0
--- /dev/null
+++ b/docs/src/cargo-toml-configuration.md
@@ -0,0 +1,29 @@
+# `Cargo.toml` Configuration
+
+`wasm-pack` can be configured via the `package.metadata.wasm-pack` key in
+`Cargo.toml`. Every option has a default, and is not required.
+
+There are three profiles: `dev`, `profiling`, and `release`. These correspond to
+the `--dev`, `--profiling`, and `--release` flags passed to `wasm-pack build`.
+
+The available configuration options and their default values are shown below:
+
+```toml
+[package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+# Should we enable wasm-bindgen's debug assertions in its generated JS glue?
+debug-js-glue = true
+# Should wasm-bindgen demangle the symbols in the "name" custom section?
+demangle-name-section = true
+# Should we emit the DWARF debug info custom sections?
+dwarf-debug-info = false
+
+[package.metadata.wasm-pack.profile.profiling.wasm-bindgen]
+debug-js-glue = false
+demangle-name-section = true
+dwarf-debug-info = false
+
+[package.metadata.wasm-pack.profile.release.wasm-bindgen]
+debug-js-glue = false
+demangle-name-section = true
+dwarf-debug-info = false
+```
diff --git a/docs/src/commands/build.md b/docs/src/commands/build.md
index 028632bd..884963b4 100644
--- a/docs/src/commands/build.md
+++ b/docs/src/commands/build.md
@@ -16,15 +16,28 @@ wasm-pack build examples/js-hello-world
 This path should point to a directory that contains a `Cargo.toml` file. If no
 path is given, the `build` command will run in the current directory.
 
-## Debug
+## Profile
 
-The init command accepts an optional `--debug` argument. This will build the
-output package using cargo's
-[default non-release profile][cargo-profile-sections-documentation]. Building
-this way is faster but applies few optimizations to the output, and enables
-debug assertions and other runtime correctness checks.
+The `build` command accepts an optional profile argument: one of `--dev`,
+`--profiling`, or `--release`. If none is supplied, then `--release` is used.
 
-The exact meaning of this flag may evolve as the platform matures.
+Th controls whether debug assertions are enabled, debug info is generated, and
+which (if any) optimizations are enabled.
+
+| Profile       | Debug Assertions | Debug Info | Optimizations | Notes                                 |
+|---------------|------------------|------------|---------------|---------------------------------------|
+| `--dev`       | Yes              | Yes        | No            | Useful for development and debugging. |
+| `--profiling` | No               | Yes        | Yes           | Useful when profiling and investigating performance issues. |
+| `--release`   | No               | No         | Yes           | Useful for shipping to production.    |
+
+The `--dev` profile will build the output package using cargo's [default
+non-release profile][cargo-profile-sections-documentation]. Building this way is
+faster but applies few optimizations to the output, and enables debug assertions
+and other runtime correctness checks. The `--profiling` and `--release` profiles
+use cargo's release profile, but the former enables debug info as well, which
+helps when investigating performance issues in a profiler.
+
+The exact meaning of the profile flags may evolve as the platform matures.
 
 [cargo-profile-sections-documentation]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections
 
diff --git a/src/bindgen.rs b/src/bindgen.rs
index 951a1045..0a849506 100644
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@@ -1,6 +1,7 @@
 //! Functionality related to installing and running `wasm-bindgen`.
 
 use child;
+use command::build::BuildProfile;
 use emoji;
 use failure::{self, ResultExt};
 use manifest::CrateData;
@@ -145,14 +146,17 @@ pub fn wasm_bindgen_build(
     out_dir: &Path,
     disable_dts: bool,
     target: &str,
-    debug: bool,
+    profile: BuildProfile,
     step: &Step,
     log: &Logger,
 ) -> Result<(), failure::Error> {
     let msg = format!("{}Running WASM-bindgen...", emoji::RUNNER);
     PBAR.step(step, &msg);
 
-    let release_or_debug = if debug { "debug" } else { "release" };
+    let release_or_debug = match profile {
+        BuildProfile::Release | BuildProfile::Profiling => "release",
+        BuildProfile::Dev => "debug",
+    };
 
     let out_dir = out_dir.to_str().unwrap();
 
@@ -181,9 +185,16 @@ pub fn wasm_bindgen_build(
         .arg(dts_arg)
         .arg(target_arg);
 
-    if debug {
+    let profile = data.configured_profile(profile);
+    if profile.wasm_bindgen_debug_js_glue() {
         cmd.arg("--debug");
     }
+    if !profile.wasm_bindgen_demangle_name_section() {
+        cmd.arg("--no-demangle");
+    }
+    if profile.wasm_bindgen_dwarf_debug_info() {
+        cmd.arg("--keep-debug");
+    }
 
     child::run(log, cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
     Ok(())
diff --git a/src/build.rs b/src/build.rs
index 327bf055..4628d37c 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -1,6 +1,7 @@
 //! Building a Rust crate into a `.wasm` binary.
 
 use child;
+use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
@@ -62,13 +63,32 @@ pub fn rustup_add_wasm_target(log: &Logger, step: &Step) -> Result<(), Error> {
 }
 
 /// Run `cargo build` targetting `wasm32-unknown-unknown`.
-pub fn cargo_build_wasm(log: &Logger, path: &Path, debug: bool, step: &Step) -> Result<(), Error> {
+pub fn cargo_build_wasm(
+    log: &Logger,
+    path: &Path,
+    profile: BuildProfile,
+    step: &Step,
+) -> Result<(), Error> {
     let msg = format!("{}Compiling to WASM...", emoji::CYCLONE);
     PBAR.step(step, &msg);
     let mut cmd = Command::new("cargo");
     cmd.current_dir(path).arg("build").arg("--lib");
-    if !debug {
-        cmd.arg("--release");
+    match profile {
+        BuildProfile::Profiling => {
+            // Once there are DWARF debug info consumers, force enable debug
+            // info, because builds that use the release cargo profile disables
+            // debug info.
+            //
+            // cmd.env("RUSTFLAGS", "-g");
+            cmd.arg("--release");
+        }
+        BuildProfile::Release => {
+            cmd.arg("--release");
+        }
+        BuildProfile::Dev => {
+            // Plain cargo builds use the dev cargo profile, which includes
+            // debug info by default.
+        }
     }
     cmd.arg("--target").arg("wasm32-unknown-unknown");
     child::run(log, cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
diff --git a/src/command/build.rs b/src/command/build.rs
index 27567866..772625b8 100644
--- a/src/command/build.rs
+++ b/src/command/build.rs
@@ -25,9 +25,8 @@ pub struct Build {
     pub scope: Option<String>,
     pub disable_dts: bool,
     pub target: String,
-    pub debug: bool,
+    pub profile: BuildProfile,
     pub mode: BuildMode,
-    // build_config: Option<BuildConfig>,
     pub out_dir: PathBuf,
     pub bindgen: Option<Download>,
     pub cache: Cache,
@@ -64,6 +63,18 @@ impl FromStr for BuildMode {
     }
 }
 
+/// The build profile controls whether optimizations, debug info, and assertions
+/// are enabled or disabled.
+#[derive(Clone, Copy, Debug)]
+pub enum BuildProfile {
+    /// Enable assertions and debug info. Disable optimizations.
+    Dev,
+    /// Enable optimizations. Disable assertions and debug info.
+    Release,
+    /// Enable optimizations and debug info. Disable assertions.
+    Profiling,
+}
+
 /// Everything required to configure and run the `wasm-pack build` command.
 #[derive(Debug, StructOpt)]
 pub struct BuildOptions {
@@ -89,10 +100,22 @@ pub struct BuildOptions {
     pub target: String,
 
     #[structopt(long = "debug")]
-    /// Build without --release.
+    /// Deprecated. Renamed to `--dev`.
     debug: bool,
-    // build config from manifest
-    // build_config: Option<BuildConfig>,
+
+    #[structopt(long = "dev")]
+    /// Create a development build. Enable debug info, and disable
+    /// optimizations.
+    dev: bool,
+
+    #[structopt(long = "release")]
+    /// Create a release build. Enable optimizations and disable debug info.
+    release: bool,
+
+    #[structopt(long = "profiling")]
+    /// Create a profiling build. Enable optimizations and debug info.
+    profiling: bool,
+
     #[structopt(long = "out-dir", short = "d", default_value = "pkg")]
     /// Sets the output directory with a relative path.
     pub out_dir: String,
@@ -106,16 +129,25 @@ impl Build {
         let crate_path = set_crate_path(build_opts.path)?;
         let crate_data = manifest::CrateData::new(&crate_path)?;
         let out_dir = crate_path.join(PathBuf::from(build_opts.out_dir));
-        // let build_config = manifest::xxx(&crate_path).xxx();
+
+        let dev = build_opts.dev || build_opts.debug;
+        let profile = match (dev, build_opts.release, build_opts.profiling) {
+            (false, false, false) | (false, true, false) => BuildProfile::Release,
+            (true, false, false) => BuildProfile::Dev,
+            (false, false, true) => BuildProfile::Profiling,
+            // Unfortunately, `structopt` doesn't expose clap's `conflicts_with`
+            // functionality yet, so we have to implement it ourselves.
+            _ => bail!("Can only supply one of the --dev, --release, or --profiling flags"),
+        };
+
         Ok(Build {
             crate_path,
             crate_data,
             scope: build_opts.scope,
             disable_dts: build_opts.disable_dts,
             target: build_opts.target,
-            debug: build_opts.debug,
+            profile,
             mode: build_opts.mode,
-            // build_config,
             out_dir,
             bindgen: None,
             cache: Cache::new()?,
@@ -223,7 +255,7 @@ impl Build {
 
     fn step_build_wasm(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
         info!(&log, "Building wasm...");
-        build::cargo_build_wasm(log, &self.crate_path, self.debug, step)?;
+        build::cargo_build_wasm(log, &self.crate_path, self.profile, step)?;
 
         info!(
             &log,
@@ -298,7 +330,7 @@ impl Build {
             &self.out_dir,
             self.disable_dts,
             &self.target,
-            self.debug,
+            self.profile,
             step,
             log,
         )?;
diff --git a/src/command/test.rs b/src/command/test.rs
index 726da7c2..81e5c2b5 100644
--- a/src/command/test.rs
+++ b/src/command/test.rs
@@ -188,7 +188,6 @@ impl Test {
         match self.mode {
             BuildMode::Normal => steps![
                 step_check_rustc_version,
-                step_check_crate_config,
                 step_add_wasm_target,
                 step_build_tests,
                 step_install_wasm_bindgen,
@@ -213,7 +212,6 @@ impl Test {
                 step_test_safari if self.safari,
             ],
             BuildMode::Noinstall => steps![
-                step_check_crate_config,
                 step_build_tests,
                 step_install_wasm_bindgen,
                 step_test_node if self.node,
@@ -234,13 +232,6 @@ impl Test {
         Ok(())
     }
 
-    fn step_check_crate_config(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(log, "Checking crate configuration...");
-        self.crate_data.check_crate_config(step)?;
-        info!(log, "Crate is correctly configured.");
-        Ok(())
-    }
-
     fn step_add_wasm_target(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
         info!(&log, "Adding wasm-target...");
         build::rustup_add_wasm_target(log, step)?;
diff --git a/src/command/utils.rs b/src/command/utils.rs
index 1e49d853..fee4d4f3 100644
--- a/src/command/utils.rs
+++ b/src/command/utils.rs
@@ -4,19 +4,13 @@ use emoji;
 use failure;
 use progressbar::Step;
 use std::fs;
-use std::io;
 use std::path::{Path, PathBuf};
 use PBAR;
 
 /// If an explicit path is given, then use it, otherwise assume the current
 /// directory is the crate path.
-pub fn set_crate_path(path: Option<PathBuf>) -> io::Result<PathBuf> {
-    let crate_path = match path {
-        Some(p) => p,
-        None => PathBuf::from("."),
-    };
-
-    crate_path.canonicalize()
+pub fn set_crate_path(path: Option<PathBuf>) -> Result<PathBuf, failure::Error> {
+    Ok(path.unwrap_or(PathBuf::from(".")))
 }
 
 /// Construct our `pkg` directory in the crate.
diff --git a/src/lib.rs b/src/lib.rs
index 206a8b7c..ff3cb2cd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,6 +11,7 @@ extern crate which;
 #[macro_use]
 extern crate lazy_static;
 extern crate parking_lot;
+extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
diff --git a/src/manifest/mod.rs b/src/manifest/mod.rs
index e418cd3f..8c3e3902 100644
--- a/src/manifest/mod.rs
+++ b/src/manifest/mod.rs
@@ -9,9 +9,11 @@ use self::npm::{
     repository::Repository, CommonJSPackage, ESModulesPackage, NoModulesPackage, NpmPackage,
 };
 use cargo_metadata::Metadata;
+use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
+use serde::{self, Deserialize};
 use serde_json;
 use toml;
 use PBAR;
@@ -34,6 +36,157 @@ struct CargoPackage {
     description: Option<String>,
     license: Option<String>,
     repository: Option<String>,
+
+    #[serde(default)]
+    metadata: CargoMetadata,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoMetadata {
+    #[serde(default, rename = "wasm-pack")]
+    wasm_pack: CargoWasmPack,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoWasmPack {
+    #[serde(default)]
+    profile: CargoWasmPackProfiles,
+}
+
+#[derive(Deserialize)]
+struct CargoWasmPackProfiles {
+    #[serde(
+        default = "CargoWasmPackProfile::default_dev",
+        deserialize_with = "CargoWasmPackProfile::deserialize_dev"
+    )]
+    dev: CargoWasmPackProfile,
+
+    #[serde(
+        default = "CargoWasmPackProfile::default_release",
+        deserialize_with = "CargoWasmPackProfile::deserialize_release"
+    )]
+    release: CargoWasmPackProfile,
+
+    #[serde(
+        default = "CargoWasmPackProfile::default_profiling",
+        deserialize_with = "CargoWasmPackProfile::deserialize_profiling"
+    )]
+    profiling: CargoWasmPackProfile,
+}
+
+impl Default for CargoWasmPackProfiles {
+    fn default() -> CargoWasmPackProfiles {
+        CargoWasmPackProfiles {
+            dev: CargoWasmPackProfile::default_dev(),
+            release: CargoWasmPackProfile::default_release(),
+            profiling: CargoWasmPackProfile::default_profiling(),
+        }
+    }
+}
+
+/// This is where configuration goes for wasm-bindgen, wasm-opt, wasm-snip, or
+/// anything else that wasm-pack runs.
+#[derive(Default, Deserialize)]
+pub struct CargoWasmPackProfile {
+    #[serde(default, rename = "wasm-bindgen")]
+    wasm_bindgen: CargoWasmPackProfileWasmBindgen,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoWasmPackProfileWasmBindgen {
+    #[serde(default, rename = "debug-js-glue")]
+    debug_js_glue: Option<bool>,
+
+    #[serde(default, rename = "demangle-name-section")]
+    demangle_name_section: Option<bool>,
+
+    #[serde(default, rename = "dwarf-debug-info")]
+    dwarf_debug_info: Option<bool>,
+}
+
+impl CargoWasmPackProfile {
+    fn default_dev() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(true),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn default_release() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(false),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn default_profiling() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(false),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn deserialize_dev<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_dev());
+        Ok(profile)
+    }
+
+    fn deserialize_release<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_release());
+        Ok(profile)
+    }
+
+    fn deserialize_profiling<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_profiling());
+        Ok(profile)
+    }
+
+    fn update_with_defaults(&mut self, defaults: Self) {
+        macro_rules! d {
+            ( $( $path:ident ).* ) => {
+                self. $( $path ).* .get_or_insert(defaults. $( $path ).* .unwrap());
+            }
+        }
+        d!(wasm_bindgen.debug_js_glue);
+        d!(wasm_bindgen.demangle_name_section);
+        d!(wasm_bindgen.dwarf_debug_info);
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.debug-js-glue]` value.
+    pub fn wasm_bindgen_debug_js_glue(&self) -> bool {
+        self.wasm_bindgen.debug_js_glue.unwrap()
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.demangle-name-section]` value.
+    pub fn wasm_bindgen_demangle_name_section(&self) -> bool {
+        self.wasm_bindgen.demangle_name_section.unwrap()
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.dwarf-debug-info]` value.
+    pub fn wasm_bindgen_dwarf_debug_info(&self) -> bool {
+        self.wasm_bindgen.dwarf_debug_info.unwrap()
+    }
 }
 
 struct NpmData {
@@ -88,6 +241,15 @@ impl CrateData {
         }
     }
 
+    /// Get the configured profile.
+    pub fn configured_profile(&self, profile: BuildProfile) -> &CargoWasmPackProfile {
+        match profile {
+            BuildProfile::Dev => &self.manifest.package.metadata.wasm_pack.profile.dev,
+            BuildProfile::Profiling => &self.manifest.package.metadata.wasm_pack.profile.profiling,
+            BuildProfile::Release => &self.manifest.package.metadata.wasm_pack.profile.release,
+        }
+    }
+
     /// Check that the crate the given path is properly configured.
     pub fn check_crate_config(&self, step: &Step) -> Result<(), Error> {
         let msg = format!("{}Checking crate configuration...", emoji::WRENCH);
diff --git a/tests/all/build.rs b/tests/all/build.rs
index 91a15e08..cc21fbb5 100644
--- a/tests/all/build.rs
+++ b/tests/all/build.rs
@@ -1,3 +1,4 @@
+use std::fs;
 use std::path::Path;
 use structopt::StructOpt;
 use utils;
@@ -125,3 +126,105 @@ fn renamed_crate_name_works() {
     .unwrap();
     fixture.run(cli.cmd).unwrap();
 }
+
+#[test]
+fn it_should_build_nested_project_with_transitive_dependencies() {
+    let fixture = utils::fixture::transitive_dependencies();
+    fixture.install_local_wasm_bindgen();
+    let cli = Cli::from_iter_safe(vec![
+        "wasm-pack",
+        "build",
+        &fixture.path.join("main").display().to_string(),
+    ])
+    .unwrap();
+    fixture.run(cli.cmd).unwrap();
+}
+
+#[test]
+fn build_different_profiles() {
+    let fixture = utils::fixture::js_hello_world();
+    fixture.install_local_wasm_bindgen();
+
+    for profile in ["--dev", "--debug", "--profiling", "--release"]
+        .iter()
+        .cloned()
+    {
+        let cli = Cli::from_iter_safe(vec![
+            "wasm-pack",
+            "build",
+            profile,
+            &fixture.path.display().to_string(),
+        ])
+        .unwrap();
+        fixture.run(cli.cmd).unwrap();
+    }
+}
+
+#[test]
+fn build_with_and_without_wasm_bindgen_debug() {
+    for debug in [true, false].iter().cloned() {
+        let fixture = utils::fixture::Fixture::new();
+        fixture
+            .readme()
+            .file(
+                "Cargo.toml",
+                format!(
+                    r#"
+                    [package]
+                    authors = ["The wasm-pack developers"]
+                    description = "so awesome rust+wasm package"
+                    license = "WTFPL"
+                    name = "whatever"
+                    repository = "https://github.com/rustwasm/wasm-pack.git"
+                    version = "0.1.0"
+
+                    [lib]
+                    crate-type = ["cdylib"]
+
+                    [dependencies]
+                    wasm-bindgen = "0.2"
+
+                    [package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+                    debug-js-glue = {}
+                    "#,
+                    debug
+                ),
+            )
+            .file(
+                "src/lib.rs",
+                r#"
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                #[wasm_bindgen]
+                pub struct MyThing {}
+
+                #[wasm_bindgen]
+                impl MyThing {
+                    pub fn new() -> MyThing {
+                        MyThing {}
+                    }
+
+                    pub fn take(self) {}
+                }
+                "#,
+            );
+
+        let cli = Cli::from_iter_safe(vec![
+            "wasm-pack",
+            "build",
+            "--dev",
+            &fixture.path.display().to_string(),
+        ])
+        .unwrap();
+
+        fixture.run(cli.cmd).unwrap();
+
+        let contents = fs::read_to_string(fixture.path.join("pkg/whatever.js")).unwrap();
+        assert_eq!(
+            contents.contains("throw new Error('Attempt to use a moved value')"),
+            debug,
+            "Should only contain moved value assertions when debug assertions are enabled"
+        );
+    }
+}
diff --git a/tests/all/manifest.rs b/tests/all/manifest.rs
index 2c60f781..6bc9df8c 100644
--- a/tests/all/manifest.rs
+++ b/tests/all/manifest.rs
@@ -2,8 +2,10 @@ use std::collections::HashSet;
 use std::fs;
 use std::path::PathBuf;
 
+use structopt::StructOpt;
+
 use utils::{self, fixture};
-use wasm_pack::{self, manifest};
+use wasm_pack::{self, manifest, Cli};
 
 #[test]
 fn it_gets_the_crate_name_default_path() {
@@ -286,3 +288,48 @@ fn it_does_not_error_when_wasm_bindgen_is_declared() {
     let step = wasm_pack::progressbar::Step::new(1);
     crate_data.check_crate_config(&step).unwrap();
 }
+
+#[test]
+fn configure_wasm_bindgen_debug_incorrectly_is_error() {
+    let fixture = utils::fixture::Fixture::new();
+    fixture
+        .readme()
+        .file(
+            "Cargo.toml",
+            r#"
+            [package]
+            authors = ["The wasm-pack developers"]
+            description = "so awesome rust+wasm package"
+            license = "WTFPL"
+            name = "whatever"
+            repository = "https://github.com/rustwasm/wasm-pack.git"
+            version = "0.1.0"
+
+            [lib]
+            crate-type = ["cdylib"]
+
+            [dependencies]
+            wasm-bindgen = "0.2"
+
+            [package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+            debug-js-glue = "not a boolean"
+            "#,
+        )
+        .hello_world_src_lib();
+
+    let cli = Cli::from_iter_safe(vec![
+        "wasm-pack",
+        "build",
+        "--dev",
+        &fixture.path.display().to_string(),
+    ])
+    .unwrap();
+
+    let result = fixture.run(cli.cmd);
+    assert!(result.is_err());
+
+    let err = result.unwrap_err();
+    assert!(err.iter_chain().any(|c| c
+        .to_string()
+        .contains("package.metadata.wasm-pack.profile.dev.wasm-bindgen.debug")));
+}
diff --git a/tests/all/test.rs b/tests/all/test.rs
index 718f275b..278959ab 100644
--- a/tests/all/test.rs
+++ b/tests/all/test.rs
@@ -286,3 +286,51 @@ fn renamed_crate_name_works() {
     });
     fixture.run(cmd).unwrap();
 }
+
+#[test]
+fn cdylib_not_required() {
+    let fixture = fixture::Fixture::new();
+    fixture
+        .readme()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.1.0"
+                authors = []
+
+                [dependencies]
+                wasm-bindgen = "=0.2.21"
+
+                [dev-dependencies]
+                wasm-bindgen-test = "=0.2.21"
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            r#"
+                pub fn foo() -> u32 { 1 }
+            "#,
+        )
+        .file(
+            "tests/foo.rs",
+            r#"
+                extern crate wasm_bindgen_test;
+                use wasm_bindgen_test::*;
+
+                #[wasm_bindgen_test]
+                fn smoke() {
+                    foo::foo();
+                }
+            "#,
+        );
+    fixture.install_local_wasm_bindgen();
+    let cmd = Command::Test(test::TestOptions {
+        path: Some(fixture.path.clone()),
+        node: true,
+        mode: build::BuildMode::Noinstall,
+        ..Default::default()
+    });
+    fixture.run(cmd).unwrap();
+}
diff --git a/tests/all/utils/fixture.rs b/tests/all/utils/fixture.rs
index b916c6bf..710bc790 100644
--- a/tests/all/utils/fixture.rs
+++ b/tests/all/utils/fixture.rs
@@ -437,3 +437,156 @@ pub fn wbg_test_node() -> Fixture {
         );
     fixture
 }
+
+pub fn transitive_dependencies() -> Fixture {
+    fn project_main_fixture(fixture: &mut Fixture) {
+        fixture.file(PathBuf::from("main/README"), "# Main Fixture\n");
+        fixture.file(
+            PathBuf::from("main/Cargo.toml"),
+            r#"
+            [package]
+            authors = ["The wasm-pack developers"]
+            description = "so awesome rust+wasm package"
+            license = "WTFPL"
+            name = "main_project"
+            repository = "https://github.com/rustwasm/wasm-pack.git"
+            version = "0.1.0"
+
+            [lib]
+            crate-type = ["cdylib"]
+
+            [dependencies]
+            wasm-bindgen = "=0.2.21"
+            project_a = { path = "../project_a" }
+            project_b = { path = "../project_b" }
+
+            [dev-dependencies]
+            wasm-bindgen-test = "=0.2.21"
+        "#,
+        );
+        fixture.file(
+            PathBuf::from("main/src/lib.rs"),
+            r#"
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                // Import the `window.alert` function from the Web.
+                #[wasm_bindgen]
+                extern {
+                    fn alert(s: &str);
+                }
+
+                // Export a `greet` function from Rust to JavaScript, that alerts a
+                // hello message.
+                #[wasm_bindgen]
+                pub fn greet(name: &str) {
+                    alert(&format!("Hello, {}!", name));
+                }
+            "#,
+        );
+    }
+
+    fn project_a_fixture(fixture: &mut Fixture) {
+        fixture.file(
+            PathBuf::from("project_a/README"),
+            "# Project Alpha Fixture\n",
+        );
+        fixture.file(
+            PathBuf::from("project_a/Cargo.toml"),
+            r#"
+            [package]
+            authors = ["The wasm-pack developers"]
+            description = "so awesome rust+wasm package"
+            license = "WTFPL"
+            name = "project_a"
+            repository = "https://github.com/rustwasm/wasm-pack.git"
+            version = "0.1.0"
+
+            [lib]
+            crate-type = ["cdylib"]
+
+            [dependencies]
+            wasm-bindgen = "=0.2.21"
+            project_b = { path = "../project_b" }
+
+            [dev-dependencies]
+            wasm-bindgen-test = "=0.2.21"
+        "#,
+        );
+        fixture.file(
+            PathBuf::from("project_a/src/lib.rs"),
+            r#"
+                extern crate wasm_bindgen;
+                // extern crate project_b;
+                use wasm_bindgen::prelude::*;
+
+                // Import the `window.alert` function from the Web.
+                #[wasm_bindgen]
+                extern {
+                    fn alert(s: &str);
+                }
+
+                // Export a `greet` function from Rust to JavaScript, that alerts a
+                // hello message.
+                #[wasm_bindgen]
+                pub fn greet(name: &str) {
+                    alert(&format!("Hello, {}!", name));
+                }
+            "#,
+        );
+    }
+
+    fn project_b_fixture(fixture: &mut Fixture) {
+        fixture.file(
+            PathBuf::from("project_b/README"),
+            "# Project Beta Fixture\n",
+        );
+        fixture.file(
+            PathBuf::from("project_b/Cargo.toml"),
+            r#"
+            [package]
+            authors = ["The wasm-pack developers"]
+            description = "so awesome rust+wasm package"
+            license = "WTFPL"
+            name = "project_b"
+            repository = "https://github.com/rustwasm/wasm-pack.git"
+            version = "0.1.0"
+
+            [lib]
+            crate-type = ["cdylib"]
+
+            [dependencies]
+            wasm-bindgen = "=0.2.21"
+
+            [dev-dependencies]
+            wasm-bindgen-test = "=0.2.21"
+        "#,
+        );
+        fixture.file(
+            PathBuf::from("project_b/src/lib.rs"),
+            r#"
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                // Import the `window.alert` function from the Web.
+                #[wasm_bindgen]
+                extern {
+                    fn alert(s: &str);
+                }
+
+                // Export a `greet` function from Rust to JavaScript, that alerts a
+                // hello message.
+                #[wasm_bindgen]
+                pub fn greet(name: &str) {
+                    alert(&format!("Hello, {}!", name));
+                }
+            "#,
+        );
+    }
+
+    let mut fixture = Fixture::new();
+    project_b_fixture(&mut fixture);
+    project_a_fixture(&mut fixture);
+    project_main_fixture(&mut fixture);
+    fixture
+}