@jsdocs-io/extractor/src/api-extractor/has-function-like-type.ts

Analyze and extract the API from npm packages

import * as tsm from 'ts-morph';

export function hasFunctionLikeType(node: tsm.VariableDeclaration): boolean {
    const typeKind = node.getTypeNode()?.getKind();
    const hasFunctionType = typeKind === tsm.SyntaxKind.FunctionType;
    if (hasFunctionType) {
        return true;
    }

    const initializer = node.getInitializer();
    if (!initializer) {
        return false;
    }

    const hasFunctionInitializer =
        tsm.Node.isArrowFunction(initializer) ||
        tsm.Node.isFunctionExpression(initializer);

    return hasFunctionInitializer;
}