/
index.spec.js
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/
index.spec.js
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import compatData from "@babel/compat-data/plugins";
import * as babelPresetEnv from "../lib/index";
import removeRegeneratorEntryPlugin from "../lib/polyfills/regenerator";
import pluginLegacyBabelPolyfill from "../lib/polyfills/babel-polyfill";
import transformations from "../lib/module-transformations";
import availablePlugins from "../lib/available-plugins";
import _pluginCoreJS2 from "babel-plugin-polyfill-corejs2";
import _pluginCoreJS3 from "babel-plugin-polyfill-corejs3";
import _pluginRegenerator from "babel-plugin-polyfill-regenerator";
const pluginCoreJS2 = _pluginCoreJS2.default;
const pluginCoreJS3 = _pluginCoreJS3.default;
const pluginRegenerator = _pluginRegenerator.default;
describe("babel-preset-env", () => {
describe("transformIncludesAndExcludes", () => {
it("should return in transforms array", () => {
expect(
babelPresetEnv.transformIncludesAndExcludes([
"transform-arrow-functions",
]),
).toEqual({
all: ["transform-arrow-functions"],
plugins: new Set(["transform-arrow-functions"]),
builtIns: new Set(),
});
});
it("should return in built-ins array", () => {
expect(babelPresetEnv.transformIncludesAndExcludes(["es.map"])).toEqual({
all: ["es.map"],
plugins: new Set(),
builtIns: new Set(["es.map"]),
});
});
});
describe("getModulesPluginNames", () => {
describe("modules is set to false", () => {
it("returns only syntax plugins", () => {
expect(
babelPresetEnv.getModulesPluginNames({
modules: false,
transformations,
shouldTransformESM: false,
shouldTransformDynamicImport: false,
shouldTransformExportNamespaceFrom: false,
}),
).toEqual(["syntax-dynamic-import", "syntax-export-namespace-from"]);
});
});
describe("modules is not set to false", () => {
describe("ESMs should not be transformed", () => {
it("returns syntax plugins", () => {
expect(
babelPresetEnv.getModulesPluginNames({
modules: "commonjs",
transformations,
shouldTransformESM: false,
shouldTransformDynamicImport: false,
shouldTransformExportNamespaceFrom: false,
}),
).toEqual(["syntax-dynamic-import", "syntax-export-namespace-from"]);
});
});
describe("ESMs should be transformed", () => {
describe("dynamic imports should not be transformed", () => {
it("returns specified modules transform and syntax-dynamic-import", () => {
expect(
babelPresetEnv.getModulesPluginNames({
modules: "commonjs",
transformations,
shouldTransformESM: true,
shouldTransformDynamicImport: false,
shouldTransformExportNamespaceFrom: false,
}),
).toEqual([
"transform-modules-commonjs",
"syntax-dynamic-import",
"syntax-export-namespace-from",
]);
});
});
describe("dynamic imports should be transformed", () => {
it("returns specified modules transform and proposal-dynamic-import", () => {
expect(
babelPresetEnv.getModulesPluginNames({
modules: "systemjs",
transformations,
shouldTransformESM: true,
shouldTransformDynamicImport: true,
shouldTransformExportNamespaceFrom: false,
}),
).toEqual([
"transform-modules-systemjs",
"proposal-dynamic-import",
"syntax-export-namespace-from",
]);
});
describe("export namespace from should be transformed", () => {
it("works", () => {
expect(
babelPresetEnv.getModulesPluginNames({
modules: "systemjs",
transformations,
shouldTransformESM: true,
shouldTransformDynamicImport: true,
shouldTransformExportNamespaceFrom: true,
}),
).toEqual([
"transform-modules-systemjs",
"proposal-dynamic-import",
"proposal-export-namespace-from",
]);
});
});
});
});
});
});
describe("getPolyfillPlugins", () => {
const staticProps = {
polyfillTargets: [],
include: new Set(),
exclude: new Set(),
proposals: false,
shippedProposals: false,
debug: false,
};
describe("useBuiltIns is false", () => {
it("returns no polyfill plugins", () => {
expect(
babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: false,
corejs: false,
regenerator: false,
},
staticProps,
),
),
).toEqual([]);
});
});
describe("useBuiltIns is not false", () => {
describe("corejs is not given", () => {
it("returns no polyfill plugins", () => {
expect(
babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "usage",
corejs: false,
regenerator: false,
},
staticProps,
),
),
).toEqual([]);
});
});
describe("useBuiltIns is set to usage", () => {
describe("using corejs 2", () => {
it("returns an array with core js 2 usage plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "usage",
corejs: { major: 2 },
regenerator: false,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(2);
expect(polyfillPlugins[0][0]).toEqual(pluginCoreJS2);
expect(polyfillPlugins[1][0]).toEqual(pluginLegacyBabelPolyfill);
});
});
describe("using corejs 3", () => {
describe("regenerator is set to false", () => {
it("returns an array with core js 3 usage plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "usage",
corejs: { major: 3 },
regenerator: false,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(2);
expect(polyfillPlugins[0][0]).toEqual(pluginCoreJS3);
expect(polyfillPlugins[1][0]).toEqual(pluginLegacyBabelPolyfill);
});
});
describe("regenerator is set to true", () => {
it("returns an array with core js 3 usage plugin and add regenerator usage plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "usage",
corejs: { major: 3 },
regenerator: true,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(3);
expect(polyfillPlugins[0][0]).toEqual(pluginCoreJS3);
expect(polyfillPlugins[1][0]).toEqual(pluginLegacyBabelPolyfill);
expect(polyfillPlugins[2][0]).toEqual(pluginRegenerator);
});
});
});
});
describe("useBuiltIns is set to entry", () => {
describe("using corejs 2", () => {
it("returns an array with core js 2 entry plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "entry",
corejs: { major: 2 },
regenerator: true,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(2);
expect(polyfillPlugins[0][0]).toEqual(pluginLegacyBabelPolyfill);
expect(polyfillPlugins[1][0]).toEqual(pluginCoreJS2);
});
});
describe("using corejs 3", () => {
describe("regenerator is set to true", () => {
it("returns an array with core js 3 entry plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "entry",
corejs: { major: 3 },
regenerator: true,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(2);
expect(polyfillPlugins[0][0]).toEqual(pluginCoreJS3);
expect(polyfillPlugins[1][0]).toEqual(pluginLegacyBabelPolyfill);
});
});
describe("regenerator is set to false", () => {
it("returns an array with core js 3 entry plugin and remove regenerator entry plugin", () => {
const polyfillPlugins = babelPresetEnv.getPolyfillPlugins(
Object.assign(
{
useBuiltIns: "entry",
corejs: { major: 3 },
regenerator: false,
},
staticProps,
),
);
expect(polyfillPlugins.length).toBe(3);
expect(polyfillPlugins[0][0]).toEqual(pluginCoreJS3);
expect(polyfillPlugins[1][0]).toEqual(pluginLegacyBabelPolyfill);
expect(polyfillPlugins[2][0]).toEqual(
removeRegeneratorEntryPlugin,
);
});
});
});
});
});
});
it("available-plugins is in sync with @babel/compat-data", () => {
const arrAvailablePlugins = Object.keys(availablePlugins).sort();
const arrCompatData = Object.keys(compatData).sort();
expect(arrAvailablePlugins).toEqual(expect.arrayContaining(arrCompatData));
});
});