Function getEffectiveTypeParameterDeclarations

test/fixtures/snapshot/typescript.js:13214–13236

* Gets the effective type parameters. If the node was parsed in a * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.

(node)

     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
     */
    function getEffectiveTypeParameterDeclarations(node) {
        if (ts.isJSDocSignature(node)) {
            return ts.emptyArray;
        }
        if (ts.isJSDocTypeAlias(node)) {
            ts.Debug.assert(node.parent.kind === 320 /* SyntaxKind.JSDoc */);
            return ts.flatMap(node.parent.tags, function (tag) { return ts.isJSDocTemplateTag(tag) ? tag.typeParameters : undefined; });
        }
        if (node.typeParameters) {
            return node.typeParameters;
        }
        if (ts.isInJSFile(node)) {
            var decls = ts.getJSDocTypeParameterDeclarations(node);
            if (decls.length) {
                return decls;
            }
            var typeTag = getJSDocType(node);
            if (typeTag && ts.isFunctionTypeNode(typeTag) && typeTag.typeParameters) {
                return typeTag.typeParameters;
            }
        }
        return ts.emptyArray;
    }
    ts.getEffectiveTypeParameterDeclarations = getEffectiveTypeParameterDeclarations;
    function getEffectiveConstraintOfTypeParameter(node) {
        return node.constraint ? node.constraint :