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Transform

transform() transforms the code, but does not transpile the code.

Features

  • Minify the code
  • Generate the source map
  • Inline source code in the source map
  • Keep the comments
  • Use only ascii characters
  • Specify the target ES version
  • Update the AST via plugins on-the-fly

Options

The following options are shared with Parse.

  • Media Type
  • Parse Mode
  • Plugin Host
  • Specifier

ASCII Only

Forces the code generator to use only ascii characters. This is useful for environments that do not support unicode.

Emit Assert for Import Attributes

It determines whether to emit assert for import attributes. Defaults to false.

Inline Sources

It determines whether the sources to be inlined in the source map. Defaults to true.

Keep Comments

It determines whether to keep comments in the output. Defaults to false.

Minify

It determines whether to minify the code. Defaults to true.

Omit Last Semi

It determines whether the code generator to emit the latest semicolon. Defaults to false.

Source Map

It determines how and if source maps should be generated. Defaults to Inline. The values are as follows:

Source Map Option Description
Inline Source map should be inlined into the source. (Default)
Separate Source map should be generated as a separate file.
None Source map should not be generated at all.

Target

The target runtime environment. This defaults to EsVersion.Latest because it preserves input as much as possible.

Note: This does not verify if output is valid for the target runtime. e.g. const foo = 1; with EsVersion.Es3 will emit as const foo = 1 without verification. This is because it's not a concern of the code generator.

The values are as follows:

ES Version Name
ES3 es3
ES5 es5
ES2015 es2015
ES2016 es2016
ES2017 es2017
ES2018 es2018
ES2019 es2019
ES2020 es2020
ES2021 es2021
ES2022 es2022
ESNext esnext