Init

.babelrc.js

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+module.exports = function (api) {
+  api.cache(true);
+
+  const ENV = process.env.BABEL_ENV || "umd";
+  //  esm cjs
+  console.log("++++++++++++++++++++++++++++++");
+  console.log("BABEL_ENV: ", ENV);
+  console.log("++++++++++++++++++++++++++++++");
+  const presets = [
+    [
+      "@babel/preset-env",
+      {
+        modules: false,
+        browserslistEnv: ENV,
+        loose: true,
+        bugfixes: true,
+      },
+    ],
+    "@babel/preset-typescript",
+  ];
+  const plugins = [
+    [
+      "@babel/plugin-transform-runtime",
+      {
+        useESModules: true,
+      },
+    ],
+  ];
+
+  return { presets, plugins, ignore: [/@babel[\\|/]runtime/] };
+};

.gitignore

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+node_modules
+.vscode/*
+dist/
+.DS_Store
+tests/
+docs/build
+docs/source/_build
+lib
+es 
+umd

LICENSE

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+ISC License
+
+Copyright (c) 2022 Unisat
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

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+# bitcoinjs-wallet

gulpfile.js

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+const gulp = require("gulp");
+const babel = require("gulp-babel");
+const ts = require("gulp-typescript");
+const tsProject = ts.createProject("tsconfig.json");
+const SRC_PATH = "src";
+
+const BUILD_MODE = {
+  ESM: {
+    PATH: "es",
+  },
+  CJS: {
+    PATH: "lib",
+  },
+};
+const CURRENT_MODE = BUILD_MODE[process.env.BABEL_ENV.toUpperCase()];
+gulp.task("build-esm", () => {
+  return gulp
+    .src([`${SRC_PATH}/**/*.ts`])
+    .pipe(babel())
+    .pipe(gulp.dest(BUILD_MODE.ESM.PATH));
+});
+
+gulp.task("build-cjs", () => {
+  return gulp
+    .src([`${SRC_PATH}/**/*.ts`])
+    .pipe(tsProject())
+    .pipe(gulp.dest(BUILD_MODE.CJS.PATH));
+});
+
+if (CURRENT_MODE == BUILD_MODE.ESM) {
+  gulp.task("build", gulp.series("build-esm"));
+} else if (CURRENT_MODE == BUILD_MODE.CJS) {
+  gulp.task("build", gulp.series("build-cjs"));
+}