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rOACCT/node_modules/babylon/bin/generate-identifier-regex.js
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generate-identifier-regex.js
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			"use strict";

			// Which Unicode version should be used?
			const version = "9.0.0";

			const start = require("unicode-" + version + "/Binary_Property/ID_Start/code-points.js")
			.filter(function(ch) { return ch > 0x7f; });
			let last = -1;
			const cont = [0x200c, 0x200d].concat(
			require("unicode-" + version + "/Binary_Property/ID_Continue/code-points.js")
			.filter(function(ch) {
			return ch > 0x7f && search(start, ch, last + 1) == -1;
			})
			);

			function search(arr, ch, starting) {
			for (let i = starting; arr[i] <= ch && i < arr.length; last = i++)
			if (arr[i] === ch)
			return i;
			return -1;
			}

			function pad(str, width) {
			while (str.length < width) str = "0" + str;
			return str;
			}

			function esc(code) {
			const hex = code.toString(16);
			if (hex.length <= 2) return "\\x" + pad(hex, 2);
			else return "\\u" + pad(hex, 4);
			}

			function generate(chars) {
			const astral = [];
			let re = "";
			for (let i = 0, at = 0x10000; i < chars.length; i++) {
			const from = chars[i];
			let to = from;
			while (i < chars.length - 1 && chars[i + 1] == to + 1) {
			i++;
			to++;
			}
			if (to <= 0xffff) {
			if (from == to) re += esc(from);
			else if (from + 1 == to) re += esc(from) + esc(to);
			else re += esc(from) + "-" + esc(to);
			} else {
			astral.push(from - at, to - from);
			at = to;
			}
			}
			return { nonASCII: re, astral: astral };
			}

			const startData = generate(start);
			const contData = generate(cont);

			console.log("let nonASCIIidentifierStartChars = \"" + startData.nonASCII + "\";");
			console.log("let nonASCIIidentifierChars = \"" + contData.nonASCII + "\";");
			console.log("const astralIdentifierStartCodes = " + JSON.stringify(startData.astral) + ";");
			console.log("const astralIdentifierCodes = " + JSON.stringify(contData.astral) + ";");