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Use Harper readonly mode for Next.js builds #41

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Use Harper readonly mode for Next.js builds #41

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4c92264
Use Harper readonly mode for Next.js builds
cb1kenobi May 1, 2026
c06a2ba
Use update readonly env var
cb1kenobi May 4, 2026
1db85d7
Use new HARPER_READONLY env var, flush databases
cb1kenobi May 4, 2026
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7 changes: 6 additions & 1 deletion src/plugin.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import type { Scope, Config, FilesOption } from 'harper';
import { flushDatabases, type Scope, type Config, type FilesOption } from 'harper';

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Module '"harper"' has no exported member 'flushDatabases'.

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GitHub Actions / Integration Tests (Node 22) 

Module '"harper"' has no exported member 'flushDatabases'.

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GitHub Actions / Integration Tests (Node 24) 

Module '"harper"' has no exported member 'flushDatabases'.

import { createRequire } from 'node:module';
import { parse as urlParse } from 'node:url';
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scope.logger.debug?.(`Building Next.js application at ${scope.directory}`);

// Next.js generates static pages using child processes and only a single process can open the
// RocksDB databases, so force Harper to start in read-only mode
process.env.HARPER_READONLY = 'true';
await flushDatabases();

// --expose-internals is set in Harper's worker execArgv but is not allowed in NODE_OPTIONS.
// Next.js reads process.execArgv to forward flags to its own child workers via NODE_OPTIONS,
// which causes Node to reject the build worker. Strip it before building and restore after.
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