Add throw expressions (#6325)

* Add throw expressions

Stage 2 proposal: https://github.com/tc39/proposal-throw-expressions

* Update babylon

* Add to stage 2

package.json

@@ -19,7 +19,7 @@
     "babel-preset-flow": "7.0.0-alpha.18",
     "babel-preset-stage-0": "7.0.0-alpha.18",
     "babel-register": "7.0.0-alpha.18",
-    "babylon": "7.0.0-beta.25",
+    "babylon": "7.0.0-beta.26",
     "browserify": "^13.1.1",
     "bundle-collapser": "^1.2.1",
     "chai": "^4.1.0",

packages/babel-core/package.json

@@ -32,7 +32,7 @@
     "babel-template": "7.0.0-beta.2",
     "babel-traverse": "7.0.0-beta.2",
     "babel-types": "7.0.0-beta.2",
-    "babylon": "7.0.0-beta.25",
+    "babylon": "7.0.0-beta.26",
     "convert-source-map": "^1.1.0",
     "debug": "^3.0.1",
     "json5": "^0.5.0",

packages/babel-generator/package.json

@@ -20,6 +20,6 @@
   },
   "devDependencies": {
     "babel-helper-fixtures": "7.0.0-beta.2",
-    "babylon": "^7.0.0-beta.25"
+    "babylon": "^7.0.0-beta.26"
   }
 }

packages/babel-plugin-syntax-throw-expressions/.npmignore

@@ -0,0 +1,3 @@
+node_modules
+*.log
+src

packages/babel-plugin-syntax-throw-expressions/README.md

@@ -0,0 +1,42 @@
+# babel-plugin-syntax-throw-expressions
+
+Allow parsing of Throw Expressions:
+
+```js
+function test(param = throw new Error('required!')) {
+  const test = param === true || throw new Error('Falsey!');
+}
+```
+
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-syntax-throw-expressions
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["syntax-throw-expressions"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins syntax-throw-expressions script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["syntax-throw-expressions"]
+});
+```

packages/babel-plugin-syntax-throw-expressions/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-syntax-throw-expressions",
+  "version": "7.0.0-beta.2",
+  "description": "Allow parsing of Throw Expressions",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-throw-expressions",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}

packages/babel-plugin-syntax-throw-expressions/src/index.js

@@ -0,0 +1,7 @@
+export default function() {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("throwExpressions");
+    },
+  };
+}

packages/babel-plugin-transform-throw-expressions/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-plugin-transform-throw-expressions/README.md

@@ -0,0 +1,47 @@
+# babel-plugin-transform-throw-expressions
+
+This plugin transforms Throw Expressions into an IIFE.
+
+## Example
+
+```js
+function test(param = throw new Error('required!')) {
+  const test = param === true || throw new Error('Falsey!');
+}
+```
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-transform-throw-expressions
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["transform-throw-expressions"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins transform-throw-expressions script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-throw-expressions"]
+});
+```
+
+## References
+
+* [Proposal: Numeric Separators](https://github.com/tc39/proposal-throw-expressions)

packages/babel-plugin-transform-throw-expressions/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "babel-plugin-transform-throw-expressions",
+  "version": "7.0.0-beta.2",
+  "description": "Wraps Throw Expressions in an IIFE",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-throw-expressions",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "babel-plugin-syntax-throw-expressions": "7.0.0-beta.2"
+  },
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "7.0.0-beta.2"
+  }
+}

packages/babel-plugin-transform-throw-expressions/src/index.js

@@ -0,0 +1,23 @@
+import syntaxThrowExpressions from "babel-plugin-syntax-throw-expressions";
+
+export default function({ types: t }) {
+  return {
+    inherits: syntaxThrowExpressions,
+
+    visitor: {
+      UnaryExpression(path) {
+        const { operator, argument } = path.node;
+        if (operator !== "throw") return;
+
+        const arg = t.identifier("e");
+        const arrow = t.functionExpression(
+          null,
+          [arg],
+          t.blockStatement([t.throwStatement(arg)]),
+        );
+
+        path.replaceWith(t.callExpression(arrow, [argument]));
+      },
+    },
+  };
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/arguments-in-argument/actual.js

@@ -0,0 +1,3 @@
+function* test() {
+  (throw new Error(...arguments));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/arguments-in-argument/expected.js

@@ -0,0 +1,5 @@
+function* test() {
+  (function (e) {
+    throw e;
+  })(new Error(...arguments));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/await-in-argument/actual.js

@@ -0,0 +1,3 @@
+async function test() {
+  (throw new Error(await 'test'));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/await-in-argument/expected.js

@@ -0,0 +1,5 @@
+async function test() {
+  (function (e) {
+    throw e;
+  })(new Error((await 'test')));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-body/actual.js

@@ -0,0 +1,3 @@
+function test() {
+  (throw new Error('test'));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-body/expected.js

@@ -0,0 +1,5 @@
+function test() {
+  (function (e) {
+    throw e;
+  })(new Error('test'));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-module/actual.js

@@ -0,0 +1 @@
+(throw new Error('test'));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-module/expected.js

@@ -0,0 +1,3 @@
+(function (e) {
+  throw e;
+})(new Error('test'));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-sequence/actual.js

@@ -0,0 +1 @@
+(throw new Error('test'), new Error('2'));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-in-sequence/expected.js

@@ -0,0 +1,3 @@
+(function (e) {
+  throw e;
+})(new Error('test')), new Error('2');

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-logical/actual.js

@@ -0,0 +1 @@
+true && throw new Error('test');

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-logical/expected.js

@@ -0,0 +1,3 @@
+true && function (e) {
+  throw e;
+}(new Error('test'));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-params/actual.js

@@ -0,0 +1,2 @@
+function test(a = throw new Error('test')) {
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-params/expected.js

@@ -0,0 +1,3 @@
+function test(a = function (e) {
+  throw e;
+}(new Error('test'))) {}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-with-comma/actual.js

@@ -0,0 +1 @@
+test((throw new Error('test'), 1));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/expression-with-comma/expected.js

@@ -0,0 +1,3 @@
+test((function (e) {
+  throw e;
+}(new Error('test')), 1));

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/function-sent-in-argument/actual.js

@@ -0,0 +1,3 @@
+function* test() {
+  (throw new Error(function.sent));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/function-sent-in-argument/expected.js

@@ -0,0 +1,5 @@
+function* test() {
+  (function (e) {
+    throw e;
+  })(new Error(function.sent));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/function-sent-in-argument/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-throw-expressions", "syntax-function-sent"]
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-throw-expressions"]
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/this-in-argument/actual.js

@@ -0,0 +1,3 @@
+function* test() {
+  (throw new Error(this));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/this-in-argument/expected.js

@@ -0,0 +1,5 @@
+function* test() {
+  (function (e) {
+    throw e;
+  })(new Error(this));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/throw-statement/actual.js

@@ -0,0 +1,3 @@
+function test() {
+  throw new Error('test');
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/throw-statement/expected.js

@@ -0,0 +1,3 @@
+function test() {
+  throw new Error('test');
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/yield-in-argument/actual.js

@@ -0,0 +1,3 @@
+function* test() {
+  (throw new Error(yield 'test'));
+}

packages/babel-plugin-transform-throw-expressions/test/fixtures/stupid-fixture-nesting-folder/yield-in-argument/expected.js

@@ -0,0 +1,5 @@
+function* test() {
+  (function (e) {
+    throw e;
+  })(new Error((yield 'test')));
+}

packages/babel-plugin-transform-throw-expressions/test/index.js

@@ -0,0 +1,3 @@
+import runner from "babel-helper-plugin-test-runner";
+
+runner(__dirname);

packages/babel-preset-stage-2/package.json

@@ -11,6 +11,7 @@
     "babel-plugin-transform-export-namespace": "7.0.0-beta.2",
     "babel-plugin-transform-function-sent": "7.0.0-beta.2",
     "babel-plugin-transform-numeric-separator": "7.0.0-beta.2",
+    "babel-plugin-transform-throw-expressions": "7.0.0-beta.2",
     "babel-preset-stage-3": "7.0.0-beta.2"
   }
 }

packages/babel-preset-stage-2/src/index.js

@@ -3,6 +3,7 @@ import presetStage3 from "babel-preset-stage-3";
 import transformFunctionSent from "babel-plugin-transform-function-sent";
 import transformExportNamespace from "babel-plugin-transform-export-namespace";
 import transformNumericSeparator from "babel-plugin-transform-numeric-separator";
+import transformThrowExpressions from "babel-plugin-transform-throw-expressions";
 
 export default function() {
   return {
@@ -11,6 +12,7 @@ export default function() {
       transformFunctionSent,
       transformExportNamespace,
       transformNumericSeparator,
+      transformThrowExpressions,
     ],
   };
 }

packages/babel-template/package.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "babel-traverse": "7.0.0-beta.2",
     "babel-types": "7.0.0-beta.2",
-    "babylon": "7.0.0-beta.25",
+    "babylon": "7.0.0-beta.26",
     "lodash": "^4.2.0"
   }
 }

packages/babel-traverse/package.json

@@ -12,7 +12,7 @@
     "babel-helper-function-name": "7.0.0-beta.2",
     "babel-messages": "7.0.0-beta.2",
     "babel-types": "7.0.0-beta.2",
-    "babylon": "7.0.0-beta.25",
+    "babylon": "7.0.0-beta.26",
     "debug": "^3.0.1",
     "globals": "^10.0.0",
     "invariant": "^2.2.0",

packages/babel-types/package.json

@@ -14,6 +14,6 @@
   },
   "devDependencies": {
     "babel-generator": "7.0.0-beta.2",
-    "babylon": "^7.0.0-beta.25"
+    "babylon": "^7.0.0-beta.26"
   }
 }

packages/babel-types/src/constants.js

@@ -47,6 +47,7 @@ export const NUMBER_UNARY_OPERATORS = ["+", "-", "~"];
 export const STRING_UNARY_OPERATORS = ["typeof"];
 export const UNARY_OPERATORS = [
   "void",
+  "throw",
   ...BOOLEAN_UNARY_OPERATORS,
   ...NUMBER_UNARY_OPERATORS,
   ...STRING_UNARY_OPERATORS,