esbuild-ifdef

This esbuild plugin allows you to include/exclude code from your bundle conditionally on compile time using /// #if comments.

Installation

# npm
npm install esbuild-ifdef

#yarn
yarn add esbuild-ifdef

Usage

Example:

/// #if NODE_ENV === "production"
console.log('production specific code');
/// #elif NODE_ENV === "debug"
console.log('debug specific code');
/// #else
/// #warning Unknown NODE_ENV
console.log('something else');
/// #endif

All directives accept any valid javascript expressions. If blocks can be nested.

Available comments

/// #if expression
/// #elseif expression, /// #elif expression
/// #else
/// #endif
/// #warning text, /// #warn text - shows up a warning at compile time
/// #error text, /// #err text - throws an error at compile time

Using plugin

esbuild.build({
    entryPoints: ['./index.js'],
    bundle: true,
    target: 'es6',
    outfile: './out.js',
    plugins: [
        ifdefPlugin({
            variables: {
                VARIABLE_NAME: 'variable value'
            },
            // ... plugin config
        })
    ]
});

Configuration

Name	Type	Default	Description
`verbose`	`boolean`	`false`	Enabled logging of the included strings and expression results
`fillWithSpaces`	`boolean`	`false`	Fill removed lines with spaces instead of commenting out
`requireTripleSlash`	`boolean`	`true`	Require usage of /// before directives
`filePath`	`RegExp`	`/\.[jt]sx?/`	File matching RegExp.
`regExp`	`RegExp`	-	Custom parsing RegExp. Overrides `requireTripleSlash` option. RegExp should have one group named `token` and one group named `expression`. Default RegExp for parsing triple slash directives is `/\/\/\/[\s]#(?<token>.?)(?:[\s]+(?<expression>.?))?[\s]$/`
`variables`	`Record<string, any>`	`process.env`	Variables for the expressions

License

MIT