diff --git a/dist/index.js b/dist/index.js
new file mode 100644
index 0000000..7c42a43
--- /dev/null
+++ b/dist/index.js
@@ -0,0 +1,802 @@
+/*!
+ * config.js - configuration parsing for bcoin
+ * Copyright (c) 2016-2017, Christopher Jeffrey (MIT License).
+ * https://github.com/bcoin-org/bcoin
+ */
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const bsert_1 = __importDefault(require("bsert"));
+const path_1 = __importDefault(require("path"));
+const os_1 = __importDefault(require("os"));
+const fs_1 = __importDefault(require("fs"));
+const HOME = os_1.default.homedir ? os_1.default.homedir() : "/";
+/**
+ * Config Parser
+ */
+class Config {
+    module;
+    prefix;
+    suffix;
+    fallback;
+    options;
+    alias = {};
+    data = {};
+    env = {};
+    args = {};
+    argv = [];
+    pass = [];
+    query = {};
+    hash = {};
+    constructor(module, options) {
+        (0, bsert_1.default)(typeof module === "string");
+        (0, bsert_1.default)(module.length > 0);
+        this.module = module;
+        this.prefix = path_1.default.join(HOME, `.${module}`);
+        if (options) {
+            this.init(options);
+        }
+    }
+    init(options) {
+        (0, bsert_1.default)(options && typeof options === "object");
+        if (options.suffix != null) {
+            (0, bsert_1.default)(typeof options.suffix === "string");
+            this.suffix = options.suffix;
+        }
+        if (options.fallback != null) {
+            (0, bsert_1.default)(typeof options.fallback === "string");
+            this.fallback = options.fallback;
+        }
+        if (options.alias) {
+            (0, bsert_1.default)(typeof options.alias === "object");
+            for (const key of Object.keys(options.alias)) {
+                const value = options.alias[key];
+                (0, bsert_1.default)(typeof value === "string");
+                this.alias[key] = value;
+            }
+        }
+    }
+    inject(options) {
+        for (const key of Object.keys(options)) {
+            const value = options[key];
+            switch (key) {
+                case "hash":
+                case "query":
+                case "env":
+                case "argv":
+                case "config":
+                    continue;
+            }
+            this.set(key, value);
+        }
+    }
+    load(options) {
+        if (options.hash) {
+            this.parseHash(options.hash);
+        }
+        if (options.query) {
+            this.parseQuery(options.query);
+        }
+        if (options.env) {
+            this.parseEnv(options.env);
+        }
+        if (options.argv) {
+            this.parseArg(options.argv);
+        }
+        this.prefix = this.getPrefix();
+    }
+    open(file) {
+        const path = this.getFile(file);
+        let text;
+        try {
+            text = fs_1.default.readFileSync(path, "utf8");
+        }
+        catch (e) {
+            if (e.code === "ENOENT")
+                return;
+            throw e;
+        }
+        this.parseConfig(text);
+        this.prefix = this.getPrefix();
+    }
+    openDir(dir) {
+        (0, bsert_1.default)(fs_1.default.existsSync(dir), `Directory ${dir} does not exist`);
+        let files = fs_1.default.readdirSync(dir).map((item) => path_1.default.join(dir, item));
+        files.forEach(this.openJson);
+    }
+    openJson(file) {
+        const path = this.getFile(file);
+        let json;
+        try {
+            json = fs_1.default.readFileSync(path, "utf8");
+            json = JSON.parse(json);
+        }
+        catch (e) {
+            if (e.code === "ENOENT")
+                return;
+            throw e;
+        }
+        (0, bsert_1.default)(typeof json === "object", `Config file ${file} must be an object`);
+        for (const key of Object.keys(json)) {
+            const value = json[key];
+            switch (value) {
+                case Array.isArray(value):
+                    let newVal = this.array(key) ?? [];
+                    newVal.push(value);
+                    this.set(key, newVal);
+                    break;
+                default:
+                    this.set(key, value);
+                    break;
+            }
+        }
+        this.prefix = this.getPrefix();
+    }
+    filter(name) {
+        (0, bsert_1.default)(typeof name === "string");
+        const child = new Config(this.module);
+        child.prefix = this.prefix;
+        child.suffix = this.suffix;
+        child.fallback = this.fallback;
+        child.argv = this.argv;
+        child.pass = this.pass;
+        _filter(name, this.env, child.env);
+        _filter(name, this.args, child.args);
+        _filter(name, this.query, child.query);
+        _filter(name, this.hash, child.hash);
+        _filter(name, this.options, child.options);
+        return child;
+    }
+    set(key, value) {
+        (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
+        if (value == null) {
+            return;
+        }
+        key = key.replace(/-/g, "");
+        key = key.toLowerCase();
+        this.options[key] = value;
+    }
+    has(key) {
+        if (typeof key === "number") {
+            (0, bsert_1.default)(key >= 0, "Index must be positive.");
+            return key < this.argv.length;
+        }
+        (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
+        key = key.replace(/-/g, "");
+        key = key.toLowerCase();
+        if (this.hash[key] !== null) {
+            return true;
+        }
+        if (this.query[key] !== null) {
+            return true;
+        }
+        if (this.args[key] !== null) {
+            return true;
+        }
+        if (this.env[key] !== null) {
+            return true;
+        }
+        if (this.data[key] !== null) {
+            return true;
+        }
+        return this.options[key] !== null;
+    }
+    get(key, fallback = null) {
+        if (Array.isArray(key)) {
+            const keys = key;
+            for (const key of keys) {
+                const value = this.get(key);
+                if (value !== null) {
+                    return value;
+                }
+            }
+            return fallback;
+        }
+        if (typeof key === "number") {
+            (0, bsert_1.default)(key >= 0, "Index must be positive.");
+            if (key >= this.argv.length) {
+                return fallback;
+            }
+            if (this.argv[key] != null) {
+                return this.argv[key];
+            }
+            return fallback;
+        }
+        (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
+        key = key.replace(/-/g, "");
+        key = key.toLowerCase();
+        if (this.hash[key] !== null) {
+            return this.hash[key];
+        }
+        if (this.query[key] !== null) {
+            return this.query[key];
+        }
+        if (this.args[key] !== null) {
+            return this.args[key];
+        }
+        if (this.env[key] !== null) {
+            return this.env[key];
+        }
+        if (this.data[key] !== null) {
+            return this.data[key];
+        }
+        if (this.options[key] !== null) {
+            return this.options[key];
+        }
+        return fallback;
+    }
+    typeOf(key) {
+        const value = this.get(key);
+        if (value === null) {
+            return "null";
+        }
+        return typeof value;
+    }
+    str(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "string") {
+            throw new Error(`${fmt(key)} must be a string.`);
+        }
+        return value;
+    }
+    int(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "string") {
+            if (typeof value !== "number") {
+                throw new Error(`${fmt(key)} must be an int.`);
+            }
+            if (!Number.isSafeInteger(value)) {
+                throw new Error(`${fmt(key)} must be an int.`);
+            }
+            return value;
+        }
+        if (!/^\-?\d+$/.test(value)) {
+            throw new Error(`${fmt(key)} must be an int.`);
+        }
+        const num = parseInt(value, 10);
+        if (!Number.isSafeInteger(num)) {
+            throw new Error(`${fmt(key)} must be an int.`);
+        }
+        return num;
+    }
+    uint(key, fallback = null) {
+        const value = this.int(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (value < 0) {
+            throw new Error(`${fmt(key)} must be a uint.`);
+        }
+        return value;
+    }
+    float(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "string") {
+            if (typeof value !== "number") {
+                throw new Error(`${fmt(key)} must be a float.`);
+            }
+            if (!isFinite(value)) {
+                throw new Error(`${fmt(key)} must be a float.`);
+            }
+            return value;
+        }
+        if (!/^\-?\d*(?:\.\d*)?$/.test(value)) {
+            throw new Error(`${fmt(key)} must be a float.`);
+        }
+        if (!/\d/.test(value)) {
+            throw new Error(`${fmt(key)} must be a float.`);
+        }
+        const num = parseFloat(value);
+        if (!isFinite(num)) {
+            throw new Error(`${fmt(key)} must be a float.`);
+        }
+        return num;
+    }
+    ufloat(key, fallback = null) {
+        const value = this.float(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (value < 0) {
+            throw new Error(`${fmt(key)} must be a positive float.`);
+        }
+        return value;
+    }
+    fixed(key, exp, fallback = null) {
+        const value = this.float(key);
+        if (value === null) {
+            return fallback;
+        }
+        try {
+            return fromFloat(value, exp || 0);
+        }
+        catch (e) {
+            throw new Error(`${fmt(key)} must be a fixed number.`);
+        }
+    }
+    ufixed(key, exp, fallback = null) {
+        const value = this.fixed(key, exp);
+        if (value === null) {
+            return fallback;
+        }
+        if (value < 0) {
+            throw new Error(`${fmt(key)} must be a positive fixed number.`);
+        }
+        return value;
+    }
+    bool(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        // Bitcoin Core compat.
+        if (typeof value === "number") {
+            if (value === 1) {
+                return true;
+            }
+            if (value === 0) {
+                return false;
+            }
+        }
+        if (typeof value !== "string") {
+            if (typeof value !== "boolean") {
+                throw new Error(`${fmt(key)} must be a boolean.`);
+            }
+            return value;
+        }
+        if (value === "true" || value === "1") {
+            return true;
+        }
+        if (value === "false" || value === "0") {
+            return false;
+        }
+        throw new Error(`${fmt(key)} must be a boolean.`);
+    }
+    buf(key, fallback = null, enc = "hex") {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "string") {
+            if (!Buffer.isBuffer(value)) {
+                throw new Error(`${fmt(key)} must be a buffer.`);
+            }
+            return value;
+        }
+        const data = Buffer.from(value, enc);
+        if (data.length !== Buffer.byteLength(value, enc)) {
+            throw new Error(`${fmt(key)} must be a ${enc} string.`);
+        }
+        return data;
+    }
+    array(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "string") {
+            if (!Array.isArray(value)) {
+                throw new Error(`${fmt(key)} must be an array.`);
+            }
+            return value;
+        }
+        const parts = value.trim().split(/\s*,\s*/);
+        const result = [];
+        for (const part of parts) {
+            if (part.length === 0) {
+                continue;
+            }
+            result.push(part);
+        }
+        return result;
+    }
+    obj(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "object" || Array.isArray(value)) {
+            throw new Error(`${fmt(key)} must be an object.`);
+        }
+        return value;
+    }
+    func(key, fallback = null) {
+        const value = this.get(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (typeof value !== "function") {
+            throw new Error(`${fmt(key)} must be a function.`);
+        }
+        return value;
+    }
+    path(key, fallback = null) {
+        let value = this.str(key);
+        if (value === null) {
+            return fallback;
+        }
+        if (value.length === 0) {
+            return fallback;
+        }
+        switch (value[0]) {
+            case "~": // home dir
+                value = path_1.default.join(HOME, value.substring(1));
+                break;
+            case "@": // prefix
+                value = path_1.default.join(this.prefix, value.substring(1));
+                break;
+            default: // cwd
+                break;
+        }
+        return path_1.default.normalize(value);
+    }
+    mb(key, fallback = null) {
+        const value = this.uint(key);
+        if (value === null) {
+            return fallback;
+        }
+        return value * 1024 * 1024;
+    }
+    getSuffix() {
+        if (!this.suffix) {
+            throw new Error("No suffix presented.");
+        }
+        const suffix = this.str(this.suffix, this.fallback);
+        (0, bsert_1.default)(isAlpha(suffix), "Bad suffix.");
+        return suffix;
+    }
+    getPrefix() {
+        let prefix = this.str("prefix");
+        if (prefix) {
+            if (prefix[0] === "~") {
+                prefix = path_1.default.join(HOME, prefix.substring(1));
+            }
+        }
+        else {
+            prefix = path_1.default.join(HOME, `.${this.module}`);
+        }
+        if (this.suffix) {
+            const suffix = this.str(this.suffix);
+            if (suffix) {
+                (0, bsert_1.default)(isAlpha(suffix), "Bad suffix.");
+                if (this.fallback && suffix !== this.fallback) {
+                    prefix = path_1.default.join(prefix, suffix);
+                }
+            }
+        }
+        return path_1.default.normalize(prefix);
+    }
+    getFile(file) {
+        const name = this.str("config");
+        if (name) {
+            return name;
+        }
+        return path_1.default.join(this.prefix, file);
+    }
+    location(file) {
+        return path_1.default.join(this.prefix, file);
+    }
+    parseConfig(text) {
+        (0, bsert_1.default)(typeof text === "string", "Config must be text.");
+        if (text.charCodeAt(0) === 0xfeff) {
+            text = text.substring(1);
+        }
+        text = text.replace(/\r\n/g, "\n");
+        text = text.replace(/\r/g, "\n");
+        text = text.replace(/\\\n/g, "");
+        let num = 0;
+        for (const chunk of text.split("\n")) {
+            const line = chunk.trim();
+            num += 1;
+            if (line.length === 0) {
+                continue;
+            }
+            if (line[0] === "#") {
+                continue;
+            }
+            const index = line.indexOf(":");
+            if (index === -1) {
+                throw new Error(`Expected ':' on line ${num}: "${line}".`);
+            }
+            let key = line.substring(0, index).trim();
+            key = key.replace(/\-/g, "");
+            if (!isLowerKey(key)) {
+                throw new Error(`Invalid option on line ${num}: ${key}.`);
+            }
+            const value = line.substring(index + 1).trim();
+            if (value.length === 0) {
+                continue;
+            }
+            const alias = this.alias[key];
+            if (alias) {
+                key = alias;
+            }
+            this.data[key] = value;
+        }
+    }
+    parseArg(argv) {
+        if (!argv || typeof argv !== "object")
+            argv = process.argv;
+        (0, bsert_1.default)(Array.isArray(argv));
+        let last = null;
+        let pass = false;
+        for (let i = 2; i < argv.length; i++) {
+            const arg = argv[i];
+            (0, bsert_1.default)(typeof arg === "string");
+            if (arg === "--") {
+                pass = true;
+                continue;
+            }
+            if (pass) {
+                this.pass.push(arg);
+                continue;
+            }
+            if (arg.length === 0) {
+                last = null;
+                continue;
+            }
+            if (arg.indexOf("--") === 0) {
+                const index = arg.indexOf("=");
+                let key = null;
+                let value = null;
+                let empty = false;
+                if (index !== -1) {
+                    // e.g. --opt=val
+                    key = arg.substring(2, index);
+                    value = arg.substring(index + 1);
+                    last = null;
+                    empty = false;
+                }
+                else {
+                    // e.g. --opt
+                    key = arg.substring(2);
+                    value = "true";
+                    last = null;
+                    empty = true;
+                }
+                key = key.replace(/\-/g, "");
+                if (!isLowerKey(key)) {
+                    throw new Error(`Invalid argument: --${key}.`);
+                }
+                if (value.length === 0) {
+                    continue;
+                }
+                // Do not allow one-letter aliases.
+                if (key.length > 1) {
+                    const alias = this.alias[key];
+                    if (alias) {
+                        key = alias;
+                    }
+                }
+                this.args[key] = value;
+                if (empty) {
+                    last = key;
+                }
+                continue;
+            }
+            if (arg[0] === "-") {
+                // e.g. -abc
+                last = null;
+                for (let j = 1; j < arg.length; j++) {
+                    let key = arg[j];
+                    if ((key < "a" || key > "z") &&
+                        (key < "A" || key > "Z") &&
+                        (key < "0" || key > "9") &&
+                        key !== "?") {
+                        throw new Error(`Invalid argument: -${key}.`);
+                    }
+                    const alias = this.alias[key];
+                    if (alias) {
+                        key = alias;
+                    }
+                    this.args[key] = "true";
+                    last = key;
+                }
+                continue;
+            }
+            // e.g. foo
+            const value = arg;
+            if (value.length === 0) {
+                last = null;
+                continue;
+            }
+            if (last) {
+                this.args[last] = value;
+                last = null;
+            }
+            else {
+                this.argv.push(value);
+            }
+        }
+    }
+    parseEnv(env) {
+        let prefix = this.module;
+        prefix = prefix.toUpperCase();
+        prefix = prefix.replace(/-/g, "_");
+        prefix += "_";
+        if (!env || typeof env !== "object") {
+            env = process.env;
+        }
+        (0, bsert_1.default)(env && typeof env === "object");
+        for (let key of Object.keys(env)) {
+            const value = env[key];
+            (0, bsert_1.default)(typeof value === "string");
+            if (key.indexOf(prefix) !== 0)
+                continue;
+            key = key.substring(prefix.length);
+            key = key.replace(/_/g, "");
+            if (!isUpperKey(key)) {
+                continue;
+            }
+            if (value.length === 0) {
+                continue;
+            }
+            key = key.toLowerCase();
+            // Do not allow one-letter aliases.
+            if (key.length > 1) {
+                const alias = this.alias[key];
+                if (alias) {
+                    key = alias;
+                }
+            }
+            this.env[key] = value;
+        }
+    }
+    parseQuery(query) {
+        if (typeof query !== "string") {
+            if (!global.location) {
+                return {};
+            }
+            query = global.location.search;
+            if (typeof query !== "string") {
+                return {};
+            }
+        }
+        return this.parseForm(query, "?", this.query);
+    }
+    parseHash(hash) {
+        if (typeof hash !== "string") {
+            if (!global.location) {
+                return {};
+            }
+            hash = global.location.hash;
+            if (typeof hash !== "string") {
+                return {};
+            }
+        }
+        return this.parseForm(hash, "#", this.hash);
+    }
+    parseForm(query, ch, map) {
+        (0, bsert_1.default)(typeof query === "string");
+        if (query.length === 0) {
+            return;
+        }
+        if (query[0] === ch) {
+            query = query.substring(1);
+        }
+        for (const pair of query.split("&")) {
+            const index = pair.indexOf("=");
+            let key, value;
+            if (index !== -1) {
+                key = pair.substring(0, index);
+                value = pair.substring(index + 1);
+            }
+            else {
+                key = pair;
+                value = "true";
+            }
+            key = unescape(key);
+            key = key.replace(/\-/g, "");
+            if (!isLowerKey(key)) {
+                continue;
+            }
+            value = unescape(value);
+            if (value.length === 0) {
+                continue;
+            }
+            const alias = this.alias[key];
+            if (alias) {
+                key = alias;
+            }
+            map[key] = value;
+        }
+    }
+}
+exports.default = Config;
+/*
+ * Helpers
+ */
+function fmt(key) {
+    if (Array.isArray(key)) {
+        key = key[0];
+    }
+    if (typeof key === "number") {
+        return `Argument #${key}`;
+    }
+    return key;
+}
+function unescape(str) {
+    try {
+        str = decodeURIComponent(str);
+        str = str.replace(/\+/g, " ");
+    }
+    catch (e) { }
+    str = str.replace(/\0/g, "");
+    return str;
+}
+function isAlpha(str) {
+    return /^[a-z0-9_\-]+$/i.test(str);
+}
+function isKey(key) {
+    return /^[a-zA-Z0-9]+$/.test(key);
+}
+function isLowerKey(key) {
+    if (!isKey(key)) {
+        return false;
+    }
+    return !/[A-Z]/.test(key);
+}
+function isUpperKey(key) {
+    if (!isKey(key)) {
+        return false;
+    }
+    return !/[a-z]/.test(key);
+}
+function _filter(name, a, b) {
+    for (const key of Object.keys(a)) {
+        if (key.length > name.length && key.indexOf(name) === 0) {
+            const sub = key.substring(name.length);
+            b[sub] = a[key];
+        }
+    }
+}
+function fromFloat(num, exp) {
+    (0, bsert_1.default)(typeof num === "number" && isFinite(num));
+    (0, bsert_1.default)(Number.isSafeInteger(exp));
+    let str = num.toFixed(exp);
+    let sign = 1;
+    if (str.length > 0 && str[0] === "-") {
+        str = str.substring(1);
+        sign = -1;
+    }
+    let hi = str;
+    let lo = "0";
+    const index = str.indexOf(".");
+    if (index !== -1) {
+        hi = str.substring(0, index);
+        lo = str.substring(index + 1);
+    }
+    hi = hi.replace(/^0+/, "");
+    lo = lo.replace(/0+$/, "");
+    (0, bsert_1.default)(hi.length <= 16 - exp, "Fixed number string exceeds 2^53-1.");
+    (0, bsert_1.default)(lo.length <= exp, "Too many decimal places in fixed number string.");
+    if (hi.length === 0) {
+        hi = "0";
+    }
+    while (lo.length < exp) {
+        lo += "0";
+    }
+    if (lo.length === 0) {
+        lo = "0";
+    }
+    (0, bsert_1.default)(/^\d+$/.test(hi) && /^\d+$/.test(lo), "Non-numeric characters in fixed number string.");
+    hi = parseInt(hi, 10);
+    lo = parseInt(lo, 10);
+    const mult = Math.pow(10, exp);
+    const maxLo = Number.MAX_SAFE_INTEGER % mult;
+    const maxHi = (Number.MAX_SAFE_INTEGER - maxLo) / mult;
+    (0, bsert_1.default)(hi < maxHi || (hi === maxHi && lo <= maxLo), "Fixed number string exceeds 2^53-1.");
+    return sign * (hi * mult + lo);
+}
+//# sourceMappingURL=index.js.map
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