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| author | littleblack111 <littleblack11111@gmail.com> | 2024-08-30 17:21:18 +0800 |
|---|---|---|
| committer | littleblack111 <littleblack11111@gmail.com> | 2024-08-30 17:21:18 +0800 |
| commit | efbc2ffe6a1ee5ec38a4396305561d6515d0943e (patch) | |
| tree | 2b4c94f18f2c792dfda813050755d5c0273fae22 /node_modules/babel-plugin-transform-remove-undefined/README.md | |
| parent | 43acceb75957c880a5ba5a31aae221394a36d5f6 (diff) | |
node fixes, updates
Diffstat (limited to 'node_modules/babel-plugin-transform-remove-undefined/README.md')
| -rw-r--r-- | node_modules/babel-plugin-transform-remove-undefined/README.md | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/node_modules/babel-plugin-transform-remove-undefined/README.md b/node_modules/babel-plugin-transform-remove-undefined/README.md new file mode 100644 index 00000000..872d740a --- /dev/null +++ b/node_modules/babel-plugin-transform-remove-undefined/README.md @@ -0,0 +1,63 @@ +# babel-plugin-transform-remove-undefined + +For variable assignments, this removes rvals that evaluate to `undefined` +(`var`s in functions only). +For functions, this removes return arguments that evaluate to `undefined`. + +## Example + +**In** + +```javascript +let a = void 0; +function foo() { + var b = undefined; + return undefined; +} +``` + +**Out** + +```javascript +let a; +function foo() { + var b; + return; +} +``` + +## Installation + +```sh +npm install babel-plugin-transform-remove-undefined --save-dev +``` + +## Usage + +### Via `.babelrc` (Recommended) + +**.babelrc** + +```json +{ + "plugins": ["babel-plugin-transform-remove-undefined"] +} +``` + +### Via CLI + +```sh +babel --plugins babel-plugin-transform-remove-undefined script.js +``` + +### Via Node API + +```javascript +require("@babel/core").transform("code", { + plugins: ["babel-plugin-transform-remove-undefined"] +}); +``` + +## Options + ++ `tdz` - Detect usages before declaration/initialization in let/const(throws) and var(void 0) |
