94 lines
2.5 KiB
JavaScript
94 lines
2.5 KiB
JavaScript
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/* eslint-env jest */
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import getProp from '../src/getProp';
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const nodeVersion = parseInt(process.version.match(/^v(\d+)\./)[1], 10);
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export const fallbackToBabylon = nodeVersion < 6;
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let parserName;
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const babelParser = fallbackToBabylon ? require('babylon') : require('@babel/parser');
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const flowParser = require('flow-parser');
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const defaultPlugins = [
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'jsx',
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'functionBind',
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'estree',
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'objectRestSpread',
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'optionalChaining',
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// 'nullishCoalescing', // TODO: update to babel 7
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];
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let plugins = [...defaultPlugins];
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let isESM = false;
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export function setParserName(name) {
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parserName = name;
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}
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export function changePlugins(pluginOrFn) {
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if (Array.isArray(pluginOrFn)) {
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plugins = pluginOrFn;
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} else if (typeof pluginOrFn === 'function') {
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plugins = pluginOrFn(plugins);
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} else {
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throw new Error('changePlugins argument should be either an array or a function');
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}
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}
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export function setIsESM() {
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isESM = true;
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}
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beforeEach(() => {
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plugins = [...defaultPlugins];
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isESM = false;
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});
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function parse(code) {
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if (parserName === undefined) {
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throw new Error('No parser specified');
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}
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if (parserName === 'babel') {
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try {
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return babelParser.parse(code, { plugins, sourceFilename: 'test.js', ...(isESM && { sourceType: 'module' }) });
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} catch (_) {
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// eslint-disable-next-line no-console
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console.warn(`Failed to parse with ${fallbackToBabylon ? 'babylon' : 'Babel'} parser.`);
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}
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}
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if (parserName === 'flow') {
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try {
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return flowParser.parse(code, { plugins });
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} catch (_) {
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// eslint-disable-next-line no-console
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console.warn('Failed to parse with the Flow parser');
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}
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}
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throw new Error(`The parser ${parserName} is not yet supported for testing.`);
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}
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export function getOpeningElement(code) {
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const parsedCode = parse(code);
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let body;
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if (parsedCode.program) {
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// eslint-disable-next-line prefer-destructuring
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body = parsedCode.program.body;
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} else {
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// eslint-disable-next-line prefer-destructuring
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body = parsedCode.body;
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}
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if (Array.isArray(body) && body[0] != null) {
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const [{ expression }] = body;
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return expression.type === 'JSXFragment' ? expression.openingFragment : expression.openingElement;
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}
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return null;
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}
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export function extractProp(code, prop = 'foo') {
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const node = getOpeningElement(code);
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const { attributes: props } = node;
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return getProp(props, prop);
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}
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export const describeIfNotBabylon = fallbackToBabylon ? describe.skip : describe;
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