Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

2.19.0: rules.map is not a function

See original GitHub issue

I’m using moo 0.5.0, with nearley 2.18.0. Upgrading to 0.5.1 and 2.19.0 respectively, then re-generating the parsers causes the following error:

TypeError: rules.map is not a function
at Function.Grammar.fromCompiled (/blah/blah/node_modules/nearley/lib/nearley.js:173:27)

The preceding call in the stack is const parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));, where the grammar is compiled with nearleyc grammar.ne -o src/grammar.ts.

I’m using node 10.17.0 with typescript 3.5.3. Have you come across this issue?

Issue Analytics

State:
Created 4 years ago
Reactions:3
Comments:5

Top GitHub Comments

6reactions

jonmintercommented, Mar 23, 2020

I was having this issue. Workaround when you’re importing your grammar do this:

import { default as myGrammar } from './my-grammar-module';
const myParser = new nearley.Parser(nearley.Grammar.fromCompiled(myGrammar));

Instead of:

import * myGrammar from './my-grammar-module';
const myParser = new nearley.Parser(nearley.Grammar.fromCompiled(myGrammar));

Unfortunately it seems this affects nearley-test as I get the same error message when trying to use the test CLI command.

0reactions

jonmintercommented, Mar 25, 2020

No problem, glad I can help!

Top Results From Across the Web

TypeError: rules.map is not a function - React js - Stack Overflow

selectedFormJSON.FORM_RULE is an object. You cannot use map on an object.

TypeError: map() is not a function in React | bobbyhadz

The "TypeError: map is not a function" occurs when we call the map() method on a value that is not an array. To...

2.19.7 Data-Mapping Attribute Rules, Clauses, and Directives

2.19.7 Data-Mapping Attribute Rules, Clauses, and Directives. This section describes how the data-mapping and data-sharing attributes of any variable ...

google earth engine - mosaic.map is not a function

You can not map over a single image. After you calculated the median of your collection, you receive only one image and .map...

aws-cdk-lib module - AWS Documentation

A Stack is the smallest physical unit of deployment, and maps directly onto a ... As a final note: Stack s are not...