# glimmerjs/glimmer-vm

Repository: https://github.com/glimmerjs/glimmer-vm
Canonical: https://ross.abutalabs.com/products/glimmer-vm
Language: TypeScript
License: MIT
License Family: permissive
Topics: typescript, glimmerjs, emberjs, hacktoberfest
Archived: true
Last push: 2026-01-06T19:21:28+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 61, release rhythm 41, longevity 100
- inputs: {"age_days": 4006, "days_push": 239, "days_rel": 399, "gap_med": 2, "n_releases_24m": 18}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1150, forks 187 (observed 2026-08-28T04:03:46.519776+00:00)

## What it is
Glimmer VM is a low-level, flexible rendering pipeline written in TypeScript that builds live DOM from Handlebars templates and cheaply updates it when data changes. It is the core rendering engine behind Ember.js, whose packages have since merged into ember-source.

## Use cases
- render handlebars templates into live dom
- build a reactive rendering engine for a javascript framework
- incrementally update dom when data changes
- understand or contribute to ember's rendering internals
- compile handlebars templates to efficient bytecode

## When to choose
- you are working on ember.js internals or its rendering pipeline
- you need a low-level handlebars-based rendering engine and can maintain it yourself

## When to avoid
- you want an actively maintained standalone library - the repo is archived and merged into ember.js
- you need a full frontend framework rather than a rendering pipeline
- you prefer non-handlebars template syntax

## Facets
- artifact type: library
- maturity: abandoned
- function: templating, frontend-framework
- domain: web-development, frontend
- platform: browser
- tags: handlebars, rendering-engine, emberjs, glimmer, dom, reactive-rendering, archived, nodejs, typescript

## Member repositories
- glimmerjs/glimmer-vm (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:46.519776+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:33:40.375285+00:00, confidence not recorded.
  - readme: https://github.com/glimmerjs/glimmer-vm (fetched 2026-08-28T04:03:46.519776+00:00, sha b3f8e3eabab9)
- Data as of 2026-08-30T08:39:29.467469+00:00.