Limit ts-jest worker usage in Jest configs to prevent memory exhaustion on high-core-count machines.

backend/api/jest.config.ts

@@ -26,4 +26,8 @@ module.exports = {
 
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }

backend/email/jest.config.ts

@@ -23,4 +23,8 @@ module.exports = {
 
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }

backend/shared/jest.config.ts

@@ -27,4 +27,8 @@ module.exports = {
 
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }

common/jest.config.ts

@@ -12,4 +12,8 @@ module.exports = {
   testMatch: ['**/*.test.ts'],
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }

jest.config.ts

@@ -21,4 +21,8 @@ module.exports = {
     '<rootDir>/web',
   ],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }

web/jest.config.js

@@ -23,4 +23,8 @@ module.exports = {
 
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/**/*.d.ts'],
   silent: true,
+  // Each ts-jest worker is a full TS-compiling process; the default (cpus - 1) can spawn enough
+  // of them in parallel to exhaust memory on high-core-count machines.
+  maxWorkers: '50%',
+  workerIdleMemoryLimit: '512MB',
 }