{"record":{"id":"95afc00bd41b38e9","repo":"handlebars-lang/handlebars.js","slug":"template-was-precompiled-with-a-newer-version-of-h","errorCode":null,"errorMessage":"Template was precompiled with a newer version of Handlebars than the current runtime. Please update your runtime to a newer version (${compilerInfo[1]}).","messagePattern":"Template was precompiled with a newer version of Handlebars than the current runtime\\. Please update your runtime to a newer version \\((.+?)\\)\\.","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"error","filePath":"lib/handlebars/runtime.js","lineNumber":40,"sourceCode":"    compilerRevision <= COMPILER_REVISION\n  ) {\n    return;\n  }\n\n  if (compilerRevision < LAST_COMPATIBLE_COMPILER_REVISION) {\n    const runtimeVersions = REVISION_CHANGES[currentRevision],\n      compilerVersions = REVISION_CHANGES[compilerRevision];\n    throw new Exception(\n      'Template was precompiled with an older version of Handlebars than the current runtime. ' +\n        'Please update your precompiler to a newer version (' +\n        runtimeVersions +\n        ') or downgrade your runtime to an older version (' +\n        compilerVersions +\n        ').'\n    );\n  } else {\n    // Use the embedded version info since the runtime doesn't know about this revision yet\n    throw new Exception(\n      'Template was precompiled with a newer version of Handlebars than the current runtime. ' +\n        'Please update your runtime to a newer version (' +\n        compilerInfo[1] +\n        ').'\n    );\n  }\n}\n\nexport function template(templateSpec, env) {\n  /* v8 ignore next */\n  if (!env) {\n    throw new Exception('No environment passed to template');\n  }\n  if (!templateSpec || !templateSpec.main) {\n    throw new Exception('Unknown template object: ' + typeof templateSpec);\n  }\n\n  templateSpec.main.decorator = templateSpec.main_d;","sourceCodeStart":22,"sourceCodeEnd":58,"githubUrl":"https://github.com/handlebars-lang/handlebars.js/blob/13a7a679910d2adbfe7f6fad61ce8f98426b0378/lib/handlebars/runtime.js#L22-L58","documentation":"The same `checkRevision` mechanism in the opposite direction: the precompiled template embeds a compiler revision newer than the runtime knows, so the runtime falls into the else branch. It cannot safely execute a template from a newer format, so it throws and tells you to update the runtime, using the version string embedded in the template (compilerInfo[1]).","triggerScenarios":"`checkRevision` sees `compilerRevision >= currentRevision` in the else branch (a revision the runtime does not know about), typically when a template was compiled by a newer handlebars than the runtime package in use.","commonSituations":"A monorepo where the build step uses a newer global/npx handlebars while the app's runtime dependency is older/locked; templates were recompiled during a dependency upgrade but the runtime update was not deployed; multiple handlebars versions resolved in different parts of node_modules.","solutions":["Update the handlebars runtime package to at least the version named in the error message (`npm install handlebars@<version from message>`)","Align the compiler used in the build with the runtime version (same handlebars entry in devDependencies/dependencies)","Dedupe node_modules (`npm ls handlebars`) so only one handlebars version is installed","Recompile and redeploy templates together with the runtime upgrade"],"exampleFix":"// before: package.json with older runtime than the compiler used\n\"dependencies\": { \"handlebars\": \"^4.1.0\" }\n\n// after: match runtime to (or above) the compiler version from the error\n\"dependencies\": { \"handlebars\": \"^4.7.8\" }\n// then: npm install && npx handlebars templates/ -f templates/compiled.js","handlingStrategy":"validation","validationCode":"import compiledSpec from './templates/compiled.js';\nimport Handlebars from 'handlebars/runtime';\n\nfunction assertRuntimeNewEnough(spec) {\n  const runtimeRevision = 7; // COMPILER_REVISION this runtime knows\n  if (spec.compiler?.[0] > runtimeRevision) {\n    throw new Error(`Template needs newer runtime (compiled by ${spec.compiler[1]}); upgrade handlebars`);\n  }\n}\nassertRuntimeNewEnough(compiledSpec);\nHandlebars.template(compiledSpec);","typeGuard":"function isKnownToRuntime(spec, knownRevision = 7) {\n  return spec && Array.isArray(spec.compiler) && spec.compiler[0] <= knownRevision;\n}","tryCatchPattern":"try {\n  const tmpl = Handlebars.template(compiledSpec);\n} catch (e) {\n  if (e.message.includes('precompiled with a newer version')) {\n    const needed = e.message.match(/\\(([^)]+)\\)\\.$/)?.[1];\n    throw new Error(`Upgrade handlebars runtime to ${needed || 'latest'}`);\n  }\n  throw e;\n}","preventionTips":["Use the handlebars package from your own node_modules for compilation (npm scripts / require('handlebars')), never a globally installed or npx-fetched newer one","Keep compiler and runtime versions locked to the same semver range","Run npm ls handlebars to detect duplicate/conflicting versions before builds","Deploy runtime upgrades and freshly compiled templates atomically"],"tags":["handlebars","precompiled-template","version-mismatch","runtime"],"backgroundTag":"precompiled-template-version-mismatch","analyzedSha":"13a7a679910d2adbfe7f6fad61ce8f98426b0378","analyzedAt":"2026-09-02T20:25:07.518Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-10T02:17:09.455Z"}