intl-messageformat-parser/build.js

#!/usr/bin/env node
const peg = require('pegjs')
const tspegjs = require("ts-pegjs");
const fs = require('fs')
const {outputFileSync} = require('fs-extra')
const grammar = fs.readFileSync('./src/parser.pegjs', 'utf-8')

// TS
const srcString = peg.generate(grammar, {
    plugins: [tspegjs],
    output: 'source',
    tspegjs: {
        customHeader: `
import { 
    MessageFormatElement, 
    LiteralElement, 
    ArgumentElement, 
    NumberElement, 
    DateElement, 
    TimeElement, 
    SelectElement, 
    PluralElement,
    PluralOrSelectOption,
    TYPE
} from './types'`
    },
    returnTypes: {
        argument: 'string',
        ws: 'string',
        digit: 'string',
        hexDigit: 'string',
        quoteEscapedChar: 'string',
        apostrophe: 'string',
        escape: 'string',
        char: 'string',
        chars: 'string',
        varName: 'string',
        number: 'number',
        start: 'MessageFormatElement[]',
        message: 'MessageFormatElement[]',
        literalElement: 'LiteralElement',
        argumentElement: 'ArgumentElement',
        selectElement: 'SelectElement',
        pluralElement: 'PluralElement',
        selectOption: 'PluralOrSelectOption',
        pluralOption: 'PluralOrSelectOption',
        simpleFormatElement: `
| NumberElement 
| DateElement 
| TimeElement 
`
    }
})

const REGEX = /ParseFunction = \((.*?)\) => (any);/g

outputFileSync('src/parser.ts', srcString.replace(REGEX, 'ParseFunction = ($1) => MessageFormatElement[];'))