Syntax Lowering

Oxc transformer supports lowering ESNext to ES2015 syntax.

Target

Oxc transformer receives a target option to specify the target runtime. This will determine which syntaxes are lowered and which warnings are emitted.

Each target environment is an environment name followed by a version number. The following environment names are currently supported:

• chrome
• deno
• edge
• firefox
• hermes
• ie
• ios
• node
• opera
• rhino
• safari
• samsung
• es

The values that are supported by esbuild's target option are supported, excluding ES5.

You can pass a single string or an array of strings:

import { transform } from "oxc-transform";

const result = await transform("lib.js", "const foo = a ?? b;", {
  target: "es2020",
  // or multiple targets:
  // target: ["chrome87", "es2022"],
});
``````js
import { transform } from "oxc-transform";

const result = await transform("lib.js", "const foo = a ?? b;", {
  target: ["chrome87", "es2022"],
  assumptions: {
    noDocumentAll: true,
  },
});