47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
import leven from "leven";
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export default function ({ messages }) {
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return {
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visitor: {
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ReferencedIdentifier(path) {
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const { node, scope } = path;
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const binding = scope.getBinding(node.name);
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if (binding && binding.kind === "type" && !path.parentPath.isFlow()) {
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throw path.buildCodeFrameError(messages.get("undeclaredVariableType", node.name), ReferenceError);
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}
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if (scope.hasBinding(node.name)) return;
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// get the closest declaration to offer as a suggestion
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// the variable name may have just been mistyped
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const bindings = scope.getAllBindings();
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let closest;
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let shortest = -1;
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for (const name in bindings) {
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const distance = leven(node.name, name);
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if (distance <= 0 || distance > 3) continue;
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if (distance <= shortest) continue;
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closest = name;
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shortest = distance;
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}
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let msg;
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if (closest) {
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msg = messages.get("undeclaredVariableSuggestion", node.name, closest);
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} else {
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msg = messages.get("undeclaredVariable", node.name);
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}
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//
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throw path.buildCodeFrameError(msg, ReferenceError);
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}
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}
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};
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}
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