49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
// This Babel plugin makes it possible to do CommonJS-style function exports
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const walked = Symbol('walked');
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module.exports = ({ types: t }) => ({
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visitor: {
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Program: {
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exit(program) {
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if (program[walked]) {
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return;
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}
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for (let path of program.get('body')) {
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if (path.isExpressionStatement()) {
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const expr = path.get('expression');
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if (expr.isAssignmentExpression() &&
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expr.get('left').matchesPattern('exports.*')) {
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const prop = expr.get('left').get('property');
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if (prop.isIdentifier({ name: 'default' })) {
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program.unshiftContainer('body', [
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t.expressionStatement(
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t.assignmentExpression('=',
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t.identifier('exports'),
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t.assignmentExpression('=',
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t.memberExpression(
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t.identifier('module'), t.identifier('exports')
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),
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expr.node.right
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)
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)
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),
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t.expressionStatement(
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t.assignmentExpression('=',
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expr.node.left, t.identifier('exports')
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)
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)
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]);
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path.remove();
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}
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}
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}
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}
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program[walked] = true;
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}
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}
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}
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});
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