@alorel-personal/build-tools/commands/clean-dist.js

"use strict";
const deleteEmpty = require("delete-empty");
const fs = require("fs");
const path_1 = require("path");
const addConfig_1 = require("../fns/add-cmd/addConfig");
const cmdName_1 = require("../fns/cmdName");
const getFiles_1 = require("../fns/getFiles");
function getNonEmptyLines(contents) {
    return contents.trim()
        .split(/\n/g)
        .map(l => l.trim())
        .filter(l => !!l);
}
function processDts(dirs) {
    const files = getFiles_1.getFiles(dirs, 'd.ts');
    if (!files.length) {
        return;
    }
    const reg = /^export\s*{};?\s*$/;
    for (const file of files) {
        const contents = fs.readFileSync(file, 'utf8');
        const lines = getNonEmptyLines(contents);
        if (lines.length !== 1 || !reg.test(lines[0])) {
            continue;
        }
        fs.unlinkSync(file);
    }
}
const jsReg = {
    //tslint:disable-next-line:max-line-length
    defEsm: /^\s*Object\s*\.\s*defineProperty\s*\(\s*(module\s*\.\s*)?exports\s*,\s*['"]__esModule['"]\s*,\s*{\s*value\s*:\s*true\s*}\s*\)\s*;?\s*$/i,
    srcMap: /^\s*\/\s*\/\s*#\s*sourceMappingURL\s*=\s*.+\s*$/i,
    useStrict: /^\s*['"]use strict['"]\s*;?\s*$/i
};
function getLineType(line) {
    if (jsReg.defEsm.test(line)) {
        return 0 /* DEF_ESM */;
    }
    else if (jsReg.srcMap.test(line)) {
        return 1 /* SRC_MAP */;
    }
    else if (jsReg.useStrict.test(line)) {
        return 2 /* USE_STRICT */;
    }
    else {
        return 3 /* ANY */;
    }
}
function shouldDeleteJs(lines) {
    //tslint:disable:no-magic-numbers
    let l1;
    let l2;
    switch (lines.length) {
        case 1:
            return getLineType(lines[0]) !== 3 /* ANY */;
        case 2:
            l1 = getLineType(lines[0]);
            l2 = getLineType(lines[1]);
            return ((l1 === 2 /* USE_STRICT */ && (l2 === 0 /* DEF_ESM */ || l2 === 1 /* SRC_MAP */))
                || (l1 === 0 /* DEF_ESM */ && l2 === 1 /* SRC_MAP */));
        case 3:
            l1 = getLineType(lines[0]);
            l2 = getLineType(lines[1]);
            const l3 = getLineType(lines[2]);
            return l1 === 2 /* USE_STRICT */ && l2 === 0 /* DEF_ESM */ && l3 === 1 /* SRC_MAP */;
        default:
            return false;
    }
    //tslint:enable:no-magic-numbers
}
function processJs(dirs) {
    const files = getFiles_1.getFiles(dirs, 'js');
    if (!files.length) {
        return;
    }
    for (const file of files) {
        const contents = fs.readFileSync(file, 'utf8');
        const lines = getNonEmptyLines(contents);
        if (!shouldDeleteJs(lines)) {
            continue;
        }
        fs.unlinkSync(file);
        const mapFile = path_1.join(path_1.dirname(file), `${path_1.basename(file)}.map`);
        if (fs.existsSync(mapFile)) {
            fs.unlinkSync(mapFile);
        }
    }
}
const command = cmdName_1.cmdName(__filename);
const cmd = {
    builder(argv) {
        return addConfig_1.addConfig(argv, command)
            .option('dist-dirs', {
            alias: 'd',
            array: true,
            demandOption: true,
            describe: 'Directories to recursively scan'
        });
    },
    command,
    describe: 'Clean dist directory from empty interface JS files and internal declarations',
    handler(c) {
        processDts(c.distDirs);
        processJs(c.distDirs);
        for (const d of c.distDirs) {
            deleteEmpty.sync(d);
        }
    }
};
module.exports = cmd;