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import deindent from '../../../utils/deindent.js';
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import getGlobals, { Globals } from './getGlobals';
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export type ModuleFormat = "es" | "amd" | "cjs" | "iife" | "umd" | "eval";
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export interface Options {
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name: string;
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amd?: {
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id?: string;
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};
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globals: Globals | object;
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onerror: (err: Error) => void;
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onwarn: (obj: Error | { message: string }) => void;
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}
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export interface Declaration {
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name: string;
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source: {
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value: string;
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};
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}
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export default function getIntro ( format: ModuleFormat, options: Options, imports: Declaration[] ) {
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if ( format === 'es' ) return '';
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if ( format === 'amd' ) return getAmdIntro( options, imports );
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if ( format === 'cjs' ) return getCjsIntro( options, imports );
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if ( format === 'iife' ) return getIifeIntro( options, imports );
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if ( format === 'umd' ) return getUmdIntro( options, imports );
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if ( format === 'eval' ) return getEvalIntro( options, imports );
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throw new Error( `Not implemented: ${format}` );
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}
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function getAmdIntro ( options: Options, imports: Declaration[] ) {
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const sourceString = imports.length ?
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`[ ${imports.map( declaration => `'${removeExtension( declaration.source.value )}'` ).join( ', ' )} ], ` :
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'';
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const id = options.amd && options.amd.id;
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return `define(${id ? ` '${id}', ` : ''}${sourceString}function (${paramString( imports )}) { 'use strict';\n\n`;
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}
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function getCjsIntro ( options: Options, imports: Declaration[] ) {
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const requireBlock = imports
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.map( declaration => `var ${declaration.name} = require( '${declaration.source.value}' );` )
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.join( '\n\n' );
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if ( requireBlock ) {
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return `'use strict';\n\n${requireBlock}\n\n`;
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}
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return `'use strict';\n\n`;
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}
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function getIifeIntro ( options: Options, imports: Declaration[] ) {
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if ( !options.name ) {
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throw new Error( `Missing required 'name' option for IIFE export` );
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}
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return `var ${options.name} = (function (${paramString( imports )}) { 'use strict';\n\n`;
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}
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function getUmdIntro ( options: Options, imports: Declaration[] ) {
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if ( !options.name ) {
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throw new Error( `Missing required 'name' option for UMD export` );
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}
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const amdId = options.amd && options.amd.id ? `'${options.amd.id}', ` : '';
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const amdDeps = imports.length ? `[${imports.map( declaration => `'${removeExtension( declaration.source.value )}'` ).join( ', ')}], ` : '';
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const cjsDeps = imports.map( declaration => `require('${declaration.source.value}')` ).join( ', ' );
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const globalDeps = getGlobals( imports, options );
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return deindent`
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(function ( global, factory ) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(${cjsDeps}) :
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typeof define === 'function' && define.amd ? define(${amdId}${amdDeps}factory) :
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(global.${options.name} = factory(${globalDeps}));
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}(this, (function (${paramString( imports )}) { 'use strict';` + '\n\n';
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}
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function getEvalIntro ( options: Options, imports: Declaration[] ) {
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return `(function (${paramString( imports )}) { 'use strict';\n\n`;
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}
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function paramString ( imports: Declaration[] ) {
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return imports.length ? ` ${imports.map( dep => dep.name ).join( ', ' )} ` : '';
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}
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function removeExtension ( file: string ) {
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const index = file.lastIndexOf( '.' );
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return ~index ? file.slice( 0, index ) : file;
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}
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