babel-plugin-transform-define

babel-plugin-transform-define

Compile time code replacement for babel similar to Webpack's DefinePlugin

---

Quick Start

npm install babel-plugin-transform-define

.babelrc

{
  "plugins": [
    ["transform-define", {
      "process.env.NODE_ENV": "production",
      "typeof window": "object"
    }]
  ]
}

.babelrc

{
  "plugins": [
    ["transform-define", "./path/to/config/file.js"]
  ]
}

Note: Paths are relative to `process.cwd()``

Reference Documentation

babel-plugin-transform-define can transform certain types of code as a babel transformation.

Identifiers

.babelrc

{
  "plugins": [
    ["transform-define", {
      "VERSION": "1.0.0",
    }]
  ]
}

Source Code

VERSION;

window.__MY_COMPANY__ = {
  version: VERSION
};

Output Code

"1.0.0";

window.__MY_COMPANY__ = {
  version: "1.0.0"
};

---

Member Expressions

.babelrc

{
  "plugins": [
    ["transform-define", {
      "process.env.NODE_ENV": "production"
    }]
  ]
}

Source Code

if (process.env.NODE_ENV === "production") {
  console.log(true);
}

Output Code

if (true) {
  console.log(true);
}

---

Unary Expressions

.babelrc

{
  "plugins": [
    ["transform-define", {
      "typeof window": "object"
    }]
  ]
}

Source Code

typeof window;
typeof window === "object";

Output Code

'object';
true;

---

License

MIT License

Changelog

1.3.2 (2019-10-22)

• Various infrastructure updates #54
  • Add CONTRIBUTING.md, yarn.lock, .npmignore, update .gitignore.
  • Switch to yarn for workflows and npm version for release workflow.
• Bug: Fix sort comparator #48
• Add test for CallExpression identifiers #35
• Fixed Markdown headings #42