Completed

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 mochawesome-report
+snapshots.d.ts
+lib

.mocharc.json

@@ -2,6 +2,6 @@
   "$schema": "https://json.schemastore.org/mocharc",
   "reporter": "mochawesome",
   "extension": [".ts"],
-  "require": ["ts-node/register"],
+  "require": ["./scripts/babel-register.js"],
   "timeout": 10000
 }

README.md

@@ -0,0 +1,3 @@
+# babel-decorators
+
+Emit beautiful looking transpiled code for decorators like `tsc`.

package.json

@@ -1,13 +1,17 @@
 {
   "name": "babel-decorators",
-  "version": "1.0.0",
+  "version": "0.1.0",
   "main": "index.js",
   "license": "MIT",
   "scripts": {
-    "test": "mocha test/**/*.ts"
+    "test": "mocha test/**/*.ts",
+    "postinstall": "mkdir -p lib; cd test/snapshots && ls | sed \"s/.*/'&'/\" | paste -sd '|' | sed -e \"s/^/export type Snapshot = /\" - > ../snapshots.d.ts"
   },
   "devDependencies": {
     "@babel/core": "^7.14.8",
+    "@babel/plugin-transform-modules-commonjs": "^7.14.5",
+    "@babel/preset-typescript": "^7.14.5",
+    "@babel/register": "^7.14.5",
     "@babel/types": "^7.14.8",
     "@types/babel__core": "^7.1.15",
     "@types/chai": "^4.2.21",
@@ -20,5 +24,13 @@
     "prettier": "^2.3.2",
     "ts-node": "^10.1.0",
     "typescript": "^4.3.5"
+  },
+  "prettier": {
+    "arrowParens": "avoid",
+    "tabWidth": 2,
+    "printWidth": 90,
+    "semi": false,
+    "singleQuote": false,
+    "trailingComma": "es5"
   }
 }

pnpm-lock.yaml

@@ -2,6 +2,9 @@ lockfileVersion: 5.3
 
 specifiers:
   '@babel/core': ^7.14.8
+  '@babel/plugin-transform-modules-commonjs': ^7.14.5
+  '@babel/preset-typescript': ^7.14.5
+  '@babel/register': ^7.14.5
   '@babel/types': ^7.14.8
   '@types/babel__core': ^7.1.15
   '@types/chai': ^4.2.21
@@ -17,6 +20,9 @@ specifiers:
 
 devDependencies:
   '@babel/core': 7.14.8
+  '@babel/plugin-transform-modules-commonjs': 7.14.5_@babel+core@7.14.8
+  '@babel/preset-typescript': 7.14.5_@babel+core@7.14.8
+  '@babel/register': 7.14.5_@babel+core@7.14.8
   '@babel/types': 7.14.8
   '@types/babel__core': 7.1.15
   '@types/chai': 4.2.21
@@ -76,6 +82,13 @@ packages:
       source-map: 0.5.7
     dev: true
 
+  /@babel/helper-annotate-as-pure/7.14.5:
+    resolution: {integrity: sha512-EivH9EgBIb+G8ij1B2jAwSH36WnGvkQSEC6CkX/6v6ZFlw5fVOHvsgGF4uiEHO2GzMvunZb6tDLQEQSdrdocrA==}
+    engines: {node: '>=6.9.0'}
+    dependencies:
+      '@babel/types': 7.14.8
+    dev: true
+
   /@babel/helper-compilation-targets/7.14.5_@babel+core@7.14.8:
     resolution: {integrity: sha512-v+QtZqXEiOnpO6EYvlImB6zCD2Lel06RzOPzmkz/D/XgQiUu3C/Jb1LOqSt/AIA34TYi/Q+KlT8vTQrgdxkbLw==}
     engines: {node: '>=6.9.0'}
@@ -89,6 +102,23 @@ packages:
       semver: 6.3.0
     dev: true
 
+  /@babel/helper-create-class-features-plugin/7.14.8_@babel+core@7.14.8:
+    resolution: {integrity: sha512-bpYvH8zJBWzeqi1o+co8qOrw+EXzQ/0c74gVmY205AWXy9nifHrOg77y+1zwxX5lXE7Icq4sPlSQ4O2kWBrteQ==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0
+    dependencies:
+      '@babel/core': 7.14.8
+      '@babel/helper-annotate-as-pure': 7.14.5
+      '@babel/helper-function-name': 7.14.5
+      '@babel/helper-member-expression-to-functions': 7.14.7
+      '@babel/helper-optimise-call-expression': 7.14.5
+      '@babel/helper-replace-supers': 7.14.5
+      '@babel/helper-split-export-declaration': 7.14.5
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
   /@babel/helper-function-name/7.14.5:
     resolution: {integrity: sha512-Gjna0AsXWfFvrAuX+VKcN/aNNWonizBj39yGwUzVDVTlMYJMK2Wp6xdpy72mfArFq5uK+NOuexfzZlzI1z9+AQ==}
     engines: {node: '>=6.9.0'}
@@ -149,6 +179,11 @@ packages:
       '@babel/types': 7.14.8
     dev: true
 
+  /@babel/helper-plugin-utils/7.14.5:
+    resolution: {integrity: sha512-/37qQCE3K0vvZKwoK4XU/irIJQdIfCJuhU5eKnNxpFDsOkgFaUAwbv+RYw6eYgsC0E4hS7r5KqGULUogqui0fQ==}
+    engines: {node: '>=6.9.0'}
+    dev: true
+
   /@babel/helper-replace-supers/7.14.5:
     resolution: {integrity: sha512-3i1Qe9/8x/hCHINujn+iuHy+mMRLoc77b2nI9TB0zjH1hvn9qGlXjWlggdwUcju36PkPCy/lpM7LLUdcTyH4Ow==}
     engines: {node: '>=6.9.0'}
@@ -211,6 +246,73 @@ packages:
     hasBin: true
     dev: true
 
+  /@babel/plugin-syntax-typescript/7.14.5_@babel+core@7.14.8:
+    resolution: {integrity: sha512-u6OXzDaIXjEstBRRoBCQ/uKQKlbuaeE5in0RvWdA4pN6AhqxTIwUsnHPU1CFZA/amYObMsuWhYfRl3Ch90HD0Q==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    dependencies:
+      '@babel/core': 7.14.8
+      '@babel/helper-plugin-utils': 7.14.5
+    dev: true
+
+  /@babel/plugin-transform-modules-commonjs/7.14.5_@babel+core@7.14.8:
+    resolution: {integrity: sha512-en8GfBtgnydoao2PS+87mKyw62k02k7kJ9ltbKe0fXTHrQmG6QZZflYuGI1VVG7sVpx4E1n7KBpNlPb8m78J+A==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    dependencies:
+      '@babel/core': 7.14.8
+      '@babel/helper-module-transforms': 7.14.8
+      '@babel/helper-plugin-utils': 7.14.5
+      '@babel/helper-simple-access': 7.14.8
+      babel-plugin-dynamic-import-node: 2.3.3
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
+  /@babel/plugin-transform-typescript/7.14.6_@babel+core@7.14.8:
+    resolution: {integrity: sha512-XlTdBq7Awr4FYIzqhmYY80WN0V0azF74DMPyFqVHBvf81ZUgc4X7ZOpx6O8eLDK6iM5cCQzeyJw0ynTaefixRA==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    dependencies:
+      '@babel/core': 7.14.8
+      '@babel/helper-create-class-features-plugin': 7.14.8_@babel+core@7.14.8
+      '@babel/helper-plugin-utils': 7.14.5
+      '@babel/plugin-syntax-typescript': 7.14.5_@babel+core@7.14.8
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
+  /@babel/preset-typescript/7.14.5_@babel+core@7.14.8:
+    resolution: {integrity: sha512-u4zO6CdbRKbS9TypMqrlGH7sd2TAJppZwn3c/ZRLeO/wGsbddxgbPDUZVNrie3JWYLQ9vpineKlsrWFvO6Pwkw==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    dependencies:
+      '@babel/core': 7.14.8
+      '@babel/helper-plugin-utils': 7.14.5
+      '@babel/helper-validator-option': 7.14.5
+      '@babel/plugin-transform-typescript': 7.14.6_@babel+core@7.14.8
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
+  /@babel/register/7.14.5_@babel+core@7.14.8:
+    resolution: {integrity: sha512-TjJpGz/aDjFGWsItRBQMOFTrmTI9tr79CHOK+KIvLeCkbxuOAk2M5QHjvruIMGoo9OuccMh5euplPzc5FjAKGg==}
+    engines: {node: '>=6.9.0'}
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    dependencies:
+      '@babel/core': 7.14.8
+      clone-deep: 4.0.1
+      find-cache-dir: 2.1.0
+      make-dir: 2.1.0
+      pirates: 4.0.1
+      source-map-support: 0.5.19
+    dev: true
+
   /@babel/template/7.14.5:
     resolution: {integrity: sha512-6Z3Po85sfxRGachLULUhOmvAaOo7xCvqGQtxINai2mEGPFm6pQ4z5QInFnUrRpfoSV60BnjyF5F3c+15fxFV1g==}
     engines: {node: '>=6.9.0'}
@@ -360,6 +462,12 @@ packages:
     resolution: {integrity: sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==}
     dev: true
 
+  /babel-plugin-dynamic-import-node/2.3.3:
+    resolution: {integrity: sha512-jZVI+s9Zg3IqA/kdi0i6UDCybUI3aSBLnglhYbSSjKlV7yF1F/5LWv8MakQmvYpnbJDS6fcBL2KzHSxNCMtWSQ==}
+    dependencies:
+      object.assign: 4.1.2
+    dev: true
+
   /balanced-match/1.0.2:
     resolution: {integrity: sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==}
     dev: true
@@ -403,6 +511,13 @@ packages:
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     dev: true
 
+  /call-bind/1.0.2:
+    resolution: {integrity: sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==}
+    dependencies:
+      function-bind: 1.1.1
+      get-intrinsic: 1.1.1
+    dev: true
+
   /camelcase/5.3.1:
     resolution: {integrity: sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==}
     engines: {node: '>=6'}
@@ -481,6 +596,15 @@ packages:
       wrap-ansi: 7.0.0
     dev: true
 
+  /clone-deep/4.0.1:
+    resolution: {integrity: sha512-neHB9xuzh/wk0dIHweyAXv2aPGZIVk3pLMe+/RNzINf17fe0OG96QroktYAUm7SM1PBnzTabaLboqqxDyMU+SQ==}
+    engines: {node: '>=6'}
+    dependencies:
+      is-plain-object: 2.0.4
+      kind-of: 6.0.3
+      shallow-clone: 3.0.1
+    dev: true
+
   /color-convert/1.9.3:
     resolution: {integrity: sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==}
     dependencies:
@@ -506,6 +630,10 @@ packages:
     resolution: {integrity: sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==}
     dev: true
 
+  /commondir/1.0.1:
+    resolution: {integrity: sha1-3dgA2gxmEnOTzKWVDqloo6rxJTs=}
+    dev: true
+
   /concat-map/0.0.1:
     resolution: {integrity: sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=}
     dev: true
@@ -566,6 +694,13 @@ packages:
       type-detect: 4.0.8
     dev: true
 
+  /define-properties/1.1.3:
+    resolution: {integrity: sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      object-keys: 1.1.1
+    dev: true
+
   /diff/4.0.2:
     resolution: {integrity: sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==}
     engines: {node: '>=0.3.1'}
@@ -614,6 +749,15 @@ packages:
       to-regex-range: 5.0.1
     dev: true
 
+  /find-cache-dir/2.1.0:
+    resolution: {integrity: sha512-Tq6PixE0w/VMFfCgbONnkiQIVol/JJL7nRMi20fqzA4NRs9AfeqMGeRdPi3wIhYkxjeBaWh2rxwapn5Tu3IqOQ==}
+    engines: {node: '>=6'}
+    dependencies:
+      commondir: 1.0.1
+      make-dir: 2.1.0
+      pkg-dir: 3.0.0
+    dev: true
+
   /find-up/3.0.0:
     resolution: {integrity: sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==}
     engines: {node: '>=6'}
@@ -658,6 +802,10 @@ packages:
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     dev: true
 
+  /function-bind/1.1.1:
+    resolution: {integrity: sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==}
+    dev: true
+
   /gensync/1.0.0-beta.2:
     resolution: {integrity: sha512-3hN7NaskYvMDLQY55gnW3NQ+mesEAepTqlg+VEbj7zzqEMBVNhzcGYYeqFo/TlYz6eQiFcp1HcsCZO+nGgS8zg==}
     engines: {node: '>=6.9.0'}
@@ -672,6 +820,14 @@ packages:
     resolution: {integrity: sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=}
     dev: true
 
+  /get-intrinsic/1.1.1:
+    resolution: {integrity: sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==}
+    dependencies:
+      function-bind: 1.1.1
+      has: 1.0.3
+      has-symbols: 1.0.2
+    dev: true
+
   /glob-parent/5.1.2:
     resolution: {integrity: sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==}
     engines: {node: '>= 6'}
@@ -714,6 +870,18 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /has-symbols/1.0.2:
+    resolution: {integrity: sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw==}
+    engines: {node: '>= 0.4'}
+    dev: true
+
+  /has/1.0.3:
+    resolution: {integrity: sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==}
+    engines: {node: '>= 0.4.0'}
+    dependencies:
+      function-bind: 1.1.1
+    dev: true
+
   /he/1.2.0:
     resolution: {integrity: sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==}
     hasBin: true
@@ -769,6 +937,13 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /is-plain-object/2.0.4:
+    resolution: {integrity: sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==}
+    engines: {node: '>=0.10.0'}
+    dependencies:
+      isobject: 3.0.1
+    dev: true
+
   /is-unicode-supported/0.1.0:
     resolution: {integrity: sha512-knxG2q4UC3u8stRGyAVJCOdxFmv5DZiRcdlIaAQXAbSfJya+OhopNotLQrstBhququ4ZpuKbDc/8S6mgXgPFPw==}
     engines: {node: '>=10'}
@@ -778,6 +953,11 @@ packages:
     resolution: {integrity: sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=}
     dev: true
 
+  /isobject/3.0.1:
+    resolution: {integrity: sha1-TkMekrEalzFjaqH5yNHMvP2reN8=}
+    engines: {node: '>=0.10.0'}
+    dev: true
+
   /js-tokens/4.0.0:
     resolution: {integrity: sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==}
     dev: true
@@ -813,6 +993,11 @@ packages:
       graceful-fs: 4.2.6
     dev: true
 
+  /kind-of/6.0.3:
+    resolution: {integrity: sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==}
+    engines: {node: '>=0.10.0'}
+    dev: true
+
   /locate-path/3.0.0:
     resolution: {integrity: sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==}
     engines: {node: '>=6'}
@@ -859,6 +1044,14 @@ packages:
       js-tokens: 4.0.0
     dev: true
 
+  /make-dir/2.1.0:
+    resolution: {integrity: sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==}
+    engines: {node: '>=6'}
+    dependencies:
+      pify: 4.0.1
+      semver: 5.7.1
+    dev: true
+
   /make-error/1.3.6:
     resolution: {integrity: sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==}
     dev: true
@@ -955,6 +1148,11 @@ packages:
     hasBin: true
     dev: true
 
+  /node-modules-regexp/1.0.0:
+    resolution: {integrity: sha1-jZ2+KJZKSsVxLpExZCEHxx6Q7EA=}
+    engines: {node: '>=0.10.0'}
+    dev: true
+
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     resolution: {integrity: sha512-uW7fodD6pyW2FZNZnp/Z3hvWKeEW1Y8R1+1CnErE8cXFXzl5blBOoVB41CvMer6P6Q0S5FXDwcHgFd1Wj0U9zg==}
     dev: true
@@ -969,6 +1167,21 @@ packages:
     engines: {node: '>=0.10.0'}
     dev: true
 
+  /object-keys/1.1.1:
+    resolution: {integrity: sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==}
+    engines: {node: '>= 0.4'}
+    dev: true
+
+  /object.assign/4.1.2:
+    resolution: {integrity: sha512-ixT2L5THXsApyiUPYKmW+2EHpXXe5Ii3M+f4e+aJFAHao5amFRW6J0OO6c/LU8Be47utCx2GL89hxGB6XSmKuQ==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      call-bind: 1.0.2
+      define-properties: 1.1.3
+      has-symbols: 1.0.2
+      object-keys: 1.1.1
+    dev: true
+
   /once/1.4.0:
     resolution: {integrity: sha1-WDsap3WWHUsROsF9nFC6753Xa9E=}
     dependencies:
@@ -1037,6 +1250,25 @@ packages:
     engines: {node: '>=8.6'}
     dev: true
 
+  /pify/4.0.1:
+    resolution: {integrity: sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==}
+    engines: {node: '>=6'}
+    dev: true
+
+  /pirates/4.0.1:
+    resolution: {integrity: sha512-WuNqLTbMI3tmfef2TKxlQmAiLHKtFhlsCZnPIpuv2Ow0RDVO8lfy1Opf4NUzlMXLjPl+Men7AuVdX6TA+s+uGA==}
+    engines: {node: '>= 6'}
+    dependencies:
+      node-modules-regexp: 1.0.0
+    dev: true
+
+  /pkg-dir/3.0.0:
+    resolution: {integrity: sha512-/E57AYkoeQ25qkxMj5PBOVgF8Kiu/h7cYS30Z5+R7WaiCCBfLq58ZI/dSeaEKb9WVJV5n/03QwrN3IeWIFllvw==}
+    engines: {node: '>=6'}
+    dependencies:
+      find-up: 3.0.0
+    dev: true
+
   /prettier/2.3.2:
     resolution: {integrity: sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==}
     engines: {node: '>=10.13.0'}
@@ -1081,6 +1313,11 @@ packages:
     resolution: {integrity: sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==}
     dev: true
 
+  /semver/5.7.1:
+    resolution: {integrity: sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==}
+    hasBin: true
+    dev: true
+
   /semver/6.3.0:
     resolution: {integrity: sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==}
     hasBin: true
@@ -1096,6 +1333,13 @@ packages:
     resolution: {integrity: sha1-BF+XgtARrppoA93TgrJDkrPYkPc=}
     dev: true
 
+  /shallow-clone/3.0.1:
+    resolution: {integrity: sha512-/6KqX+GVUdqPuPPd2LxDDxzX6CAbjJehAAOKlNpqqUpAqPM6HeL8f+o3a+JsyGjn2lv0WY8UsTgUJjU9Ok55NA==}
+    engines: {node: '>=8'}
+    dependencies:
+      kind-of: 6.0.3
+    dev: true
+
   /source-map-support/0.5.19:
     resolution: {integrity: sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==}
     dependencies:

scripts/babel-register.js

@@ -0,0 +1,5 @@
+require("@babel/register")({
+  extensions: [".js", ".jsx", ".ts", ".tsx"],
+  presets: ["@babel/preset-typescript"],
+  plugins: ["@babel/plugin-transform-modules-commonjs"],
+})

scripts/build.js

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+const fs = require("fs")
+const { format } = require("prettier")
+const babel = require("@babel/core")
+
+// Main
+const res = babel.transformFileSync("src/index.ts", {
+  presets: ["@babel/preset-typescript"],
+  plugins: ["@babel/plugin-transform-modules-commonjs"],
+})
+fs.writeFileSync("lib/index.js", format(res.code, { parser: "babel" }))
+
+// package.json
+const pkg = require("../package.json")
+delete pkg.scripts
+delete pkg.devDependencies
+delete pkg.prettier
+fs.writeFileSync("lib/package.json", JSON.stringify(pkg, null, 2))

src/index.ts

@@ -1,6 +1,184 @@
-import type * as babel from "@babel/core";
+import type * as babel from "@babel/core"
+import type * as t from "@babel/types"
 
-export default ({ types: t }: typeof babel): babel.PluginObj => ({
+interface State {
-  name: "tsc-dedent",
+  getTSLib(): t.ImportSpecifier[]
-  visitor: {},
+  getParam(): t.Identifier
-});
+  getDecorate(): t.Identifier
+}
+
+export default ({ types: t }: typeof babel): babel.PluginObj<State> => ({
+  name: "tsc-decorators",
+  visitor: {
+    Program: {
+      enter(path, state) {
+        const getTSLib = once(() => {
+          const specifiers: t.ImportSpecifier[] = []
+          const dec = t.importDeclaration(specifiers, t.stringLiteral("tslib"))
+          path.node.body.unshift(dec)
+          return specifiers
+        })
+
+        state.getTSLib = getTSLib
+
+        const createGet = (name: string) =>
+          once(() => {
+            const specifiers = getTSLib()
+            const localID = path.scope.hasBinding(name)
+              ? path.scope.generateUidIdentifier(name)
+              : t.identifier(name)
+            specifiers.push(t.importSpecifier(localID, t.identifier(name)))
+            return localID
+          })
+
+        const getParam = createGet("__param")
+        const getDecorate = createGet("__decorate")
+
+        state.getParam = () => t.cloneNode(getParam())
+        state.getDecorate = () => t.cloneNode(getDecorate())
+      },
+    },
+
+    ClassDeclaration(path, state) {
+      const modifiers: (t.Expression | t.Statement)[] = []
+      const classDecorators: t.Expression[] = []
+      const prefixes: t.Statement[] = []
+
+      const classID = path.node.id
+
+      const isNamedExport = t.isExportNamedDeclaration(path.parent)
+      const isDefaultExport = t.isExportDefaultDeclaration(path.parent)
+
+      if (path.node.decorators) {
+        classDecorators.push(...path.node.decorators.map(d => d.expression))
+        path.node.decorators = []
+      }
+
+      for (const child of path.node.body.body) {
+        switch (child.type) {
+          case "ClassProperty":
+            if (!child.decorators) continue
+            modifiers.push(
+              t.callExpression(state.getDecorate(), [
+                t.arrayExpression(child.decorators.map(d => d.expression)),
+                t.memberExpression(classID, t.identifier("prototype")),
+                t.isIdentifier(child.key) ? t.stringLiteral(child.key.name) : child.key,
+                t.unaryExpression("void", t.numericLiteral(0)),
+              ])
+            )
+            child.decorators = null
+            break
+
+          case "ClassMethod":
+            {
+              const list: t.Expression[] = []
+              if (child.decorators) {
+                list.push(...child.decorators.map(d => d.expression))
+                child.decorators = null
+              }
+
+              child.params.forEach((param, i) => {
+                pseudoAssert(!t.isTSParameterProperty(param))
+                if (!param.decorators?.length) return
+                list.push(
+                  ...param.decorators
+                    .map(d => d.expression)
+                    .map(e =>
+                      t.callExpression(state.getParam(), [t.numericLiteral(i), e])
+                    )
+                )
+                param.decorators = null
+              })
+
+              if (child.kind === "constructor") {
+                classDecorators.push(...list)
+              } else {
+                let key: t.Expression
+                if (child.computed) {
+                  const newID = path.scope.generateUidIdentifier()
+                  prefixes.push(
+                    t.variableDeclaration("let", [t.variableDeclarator(newID)])
+                  )
+                  child.key = t.assignmentExpression("=", newID, child.key)
+                  key = newID
+                } else if (t.isIdentifier(child.key)) {
+                  key = t.stringLiteral(child.key.name)
+                } else {
+                  key = child.key
+                }
+
+                modifiers.push(
+                  t.callExpression(state.getDecorate(), [
+                    t.arrayExpression(list),
+                    t.memberExpression(classID, t.identifier("prototype")),
+                    key,
+                    t.nullLiteral(),
+                  ])
+                )
+              }
+            }
+            break
+        }
+      }
+
+      if (!classDecorators.length && !modifiers.length && !prefixes.length) return
+
+      const replacees: t.Statement[] = prefixes.slice()
+      if (classDecorators.length) {
+        replacees.push(
+          t.variableDeclaration("let", [
+            t.variableDeclarator(classID, { ...path.node, type: "ClassExpression" }),
+          ])
+        )
+        modifiers.push(
+          t.assignmentExpression(
+            "=",
+            classID,
+            t.callExpression(state.getDecorate(), [
+              t.arrayExpression(classDecorators),
+              classID,
+            ])
+          )
+        )
+
+        if (isNamedExport) {
+          modifiers.push(
+            t.exportNamedDeclaration(undefined, [t.exportSpecifier(classID, classID)])
+          )
+        } else if (isDefaultExport) {
+          modifiers.push(t.exportDefaultDeclaration(classID))
+        }
+      } else {
+        let node: t.Statement = path.node
+        if (isNamedExport) {
+          node = t.exportNamedDeclaration(node, [], null)
+        } else if (isDefaultExport) {
+          node = t.exportDefaultDeclaration(node)
+        }
+        replacees.push(node)
+      }
+
+      replacees.push(
+        ...modifiers.map(e => (t.isStatement(e) ? e : t.expressionStatement(e)))
+      )
+      const replacementTarget = isNamedExport || isDefaultExport ? path.parentPath : path
+      replacementTarget.replaceWithMultiple(replacees)
+    },
+  },
+})
+
+function pseudoAssert(condition: any): asserts condition {}
+
+const once = <T extends Function>(fn: T): T => {
+  let called = false
+  let cache: any
+  return function (this: any) {
+    if (called) {
+      return cache
+    } else {
+      cache = fn.apply(this, arguments)
+      called = true
+      return cache
+    }
+  } as any
+}

test/index.ts

@@ -1,34 +1,53 @@
-import { describe, it } from "mocha";
+import { readFileSync } from "fs"
-import { expect } from "chai";
+import { describe, it } from "mocha"
-import { transform } from "@babel/core";
+import { resolve } from "path"
-import { format } from "prettier";
+import { expect } from "chai"
-import plugin from "../src/index";
+import { transform } from "@babel/core"
+import { format } from "prettier"
+import type { Snapshot } from "./snapshots"
+import plugin from "../src/index"
 
-const javascript = (code: TemplateStringsArray) =>
+const canonize = (code: string) =>
-  transform(code[0], {
+  format(code, { parser: "babel" }).trim().split("\n").filter(Boolean).join("\n")
+
+const equal = (name: Snapshot) => {
+  const folder = resolve(__dirname, "snapshots", name)
+  const actual = readFileSync(resolve(folder, "input.txt"), "utf-8")
+  const expected = readFileSync(resolve(folder, "output.txt"), "utf-8")
+  const transformed = transform(actual, {
     parserOpts: {
       plugins: ["decorators-legacy", "typescript"],
     },
+    babelrc: false,
+    configFile: false,
     plugins: [plugin],
-  })!.code!;
+  })!.code!
+  expect(canonize(transformed)).to.deep.equal(canonize(expected))
+}
 
-const canonize = (code: string) => format(code, { parser: "babel" }).trim();
+describe("tsc-decorator", () => {
+  it("works with property decorators", () => {
+    equal("properties")
+  })
 
-const equal = (actual: string, expected: string) => {
+  it("works with method decorators", () => {
-  actual = canonize(actual);
+    equal("methods")
-  expected = canonize(expected);
+  })
-  expect(actual).to.deep.equal(expected);
-};
 
-describe("", () => {
+  it("works with parameter decorators", () => {
-  it("should do nothing", () => {
+    equal("params")
-    equal(
+  })
-      javascript`
+
-      class A {}
+  // https://github.com/babel/babel/issues/13591
-    `,
+  it.skip("works with computed property keys", () => {
-      /* javascript */ `
+    equal("computedProperties")
-      class A {}
+  })
-      `
+
-    );
+  it("works with class/consrtuctor decorators", () => {
-  });
+    equal("constructor")
-});
+  })
+
+  it("does not interfere with export declarations", () => {
+    equal("exports")
+  })
+})

test/snapshots/.eslintignore

@@ -0,0 +1 @@
+*

test/snapshots/computedProperties/input.txt

@@ -0,0 +1,4 @@
+class A {
+  @decorator
+  [Symbol.iterator]() {}
+}

test/snapshots/computedProperties/output.txt

@@ -0,0 +1,5 @@
+let _a;
+class A {
+  [_a = Symbol.iterator]() { }
+}
+__decorate([decorator], A.prototype, _a, null);

test/snapshots/constructor/input.txt

@@ -0,0 +1,4 @@
+@classDecorator
+class A {
+  @prop string: string;
+}

test/snapshots/constructor/output.txt

@@ -0,0 +1,8 @@
+import { __decorate } from "tslib";
+
+let A = class A {
+  string: string;
+}
+
+__decorate([prop], A.prototype, "string", void 0);
+A = __decorate([classDecorator], A);

test/snapshots/exports/input.txt

@@ -0,0 +1,9 @@
+export class NormalDecorated {
+  @prop a: string
+}
+
+@classDecorator
+export class ClassDecorated {}
+
+@classDecorator
+export default class DefaultExport {}

test/snapshots/exports/output.txt

@@ -0,0 +1,15 @@
+import { __decorate } from "tslib";
+
+export class NormalDecorated {
+  a: string;
+}
+__decorate([prop], NormalDecorated.prototype, "a", void 0);
+
+let ClassDecorated = class ClassDecorated {};
+ClassDecorated = __decorate([classDecorator], ClassDecorated);
+
+export { ClassDecorated };
+
+let DefaultExport = class DefaultExport {};
+DefaultExport = __decorate([classDecorator], DefaultExport);
+export default DefaultExport;

test/snapshots/methods/input.txt

@@ -0,0 +1,3 @@
+class A {
+  @dec method(): string {}
+}

test/snapshots/methods/output.txt

@@ -0,0 +1,7 @@
+import { __decorate } from "tslib";
+
+class A {
+  method(): string {}
+}
+
+__decorate([dec], A.prototype, "method", null);

test/snapshots/params/input.txt

@@ -0,0 +1,6 @@
+import { __decorate } from "tslib"
+
+class A {
+  method1(skipped: string, @Arg() b: string) {}
+  method2(@Arg() a: string, @Arg() b: string) {}
+}

test/snapshots/params/output.txt

@@ -0,0 +1,10 @@
+import { __param, __decorate as _decorate } from "tslib";
+import { __decorate } from "tslib";
+
+class A {
+  method1(skipped: string, b: string) {}
+  method2(a: string, b: string) {}
+}
+
+_decorate([__param(1, Arg())], A.prototype, "method1", null);
+_decorate([__param(0, Arg()), __param(1, Arg())], A.prototype, "method2", null);

test/snapshots/properties/input.txt

@@ -0,0 +1,4 @@
+class A {
+  @dec prop: string
+  @dec @dec2 prop2: string
+}

test/snapshots/properties/output.txt

@@ -0,0 +1,9 @@
+import { __decorate } from "tslib"
+
+class A {
+  prop: string;
+  prop2: string;
+}
+
+__decorate([dec], A.prototype, "prop", void 0);
+__decorate([dec, dec2], A.prototype, "prop2", void 0);

tsconfig.json

@@ -1,5 +1,7 @@
 {
   "compilerOptions": {
+    "experimentalDecorators": true,
+    "checkJs": false,
     "strict": true,
     "noEmit": true
   }