41 lines
1.5 KiB
TypeScript
41 lines
1.5 KiB
TypeScript
import {RuleWalker} from 'tslint/lib/language/walker';
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import {RuleFailure} from 'tslint/lib/lint';
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import {AbstractRule} from 'tslint/lib/rules';
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import * as ts from 'typescript';
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export class Rule extends AbstractRule {
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public static FAILURE_STRING = 'missing type declaration';
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public apply(sourceFile: ts.SourceFile): RuleFailure[] {
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const typedefWalker = new TypedefWalker(sourceFile, this.getOptions());
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return this.applyWithWalker(typedefWalker);
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}
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}
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class TypedefWalker extends RuleWalker {
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public visitMethodDeclaration(node: ts.MethodDeclaration) {
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if (node.name.getText().charAt(0) !== '_') {
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node.parameters.forEach((p: ts.ParameterDeclaration) => {
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// a parameter's "type" could be a specific string value, for example `fn(option:
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// "someOption", anotherOption: number)`
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if (p.type == null || p.type.kind !== ts.SyntaxKind.StringLiteral) {
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this.checkTypeAnnotation(p.getEnd(), <ts.TypeNode>p.type, p.name);
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}
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});
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}
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super.visitMethodDeclaration(node);
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}
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private checkTypeAnnotation(location: number, typeAnnotation: ts.TypeNode, name?: ts.Node) {
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if (typeAnnotation == null) {
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let ns = '<name missing>';
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if (name != null && name.kind === ts.SyntaxKind.Identifier) {
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ns = (<ts.Identifier>name).text;
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}
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if (ns.charAt(0) === '_') return;
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let failure = this.createFailure(location, 1, 'expected parameter ' + ns + ' to have a type');
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this.addFailure(failure);
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}
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}
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}
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