16 lines
458 B
JavaScript
16 lines
458 B
JavaScript
var b = require("../builders");
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module.exports = function (ast, file) {
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var body = ast.program.body;
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var first = body[0];
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var noStrict = !first || first.type !== "ExpressionStatement" || first.expression.type !== "Literal" || first.expression.value !== "use strict";
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if (noStrict) {
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if (file.opts._noStrict) return;
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body.unshift(b.expressionStatement(b.literal("use strict")));
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} else {
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if (file.opts._noStrict) body.shift();
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}
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};
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