How to fix Cannot find input files matching pattern in TypeScript

// Example tsconfig.json
{
  "compilerOptions": {
    "target": "es2020",
    "module": "commonjs"
  },
  "include": ["src/**/*.ts", "src/**/*.tsx"]
}

# Check what files match your patterns
# For pattern "src/**/*.ts"
find src -name "*.ts" | head -5

# For pattern "**/*.ts"
find . -name "*.ts" | head -5

# If no files found, you need to create TypeScript files
# or adjust your patterns

{
  "compilerOptions": { /* ... */ },
  "files": [
    "src/index.ts",
    "src/utils/helpers.ts",
    "src/types.d.ts"
  ]
}

# Check each file in the files array
ls -la src/index.ts
ls -la src/utils/helpers.ts
ls -la src/types.d.ts

# If any file is missing, either:
# 1. Create the missing file
# 2. Remove it from the files array
# 3. Fix the path if it's incorrect

# Create a test directory and file
mkdir -p src
cat > src/test.ts << 'EOF'
// Test TypeScript file
const message: string = "Hello TypeScript";
console.log(message);
EOF

{
  "compilerOptions": {
    "target": "es2020",
    "module": "commonjs",
    "outDir": "./dist"
  },
  "include": ["src/**/*.ts"]
}

npx tsc

# If successful, you should see:
# - No error messages
# - dist/test.js created (if outDir is set)
# - Or test.js in same directory (if no outDir)

# If still failing, the issue is with tsconfig.json location
# or other configuration

# Check current directory and tsconfig location
pwd
ls -la tsconfig.json

# If tsconfig.json is in a subdirectory, TypeScript will look
# for files relative to that subdirectory

# Example structure:
# project/
#   ├── tsconfig.json          # Looking for src/ relative to project/
#   └── src/
#       └── index.ts          # ✓ Found: project/src/index.ts

# WRONG structure:
# project/
#   ├── config/
#   │   └── tsconfig.json    # Looking for src/ relative to config/
#   └── src/
#       └── index.ts         # ✗ Not found: config/src/index.ts doesn't exist

// tsconfig.json at project root
{
  "compilerOptions": {
    "composite": true
  },
  "references": [
    { "path": "./packages/client" },
    { "path": "./packages/server" }
  ]
}

// packages/client/tsconfig.json
{
  "extends": "../../tsconfig.base.json",
  "include": ["src/**/*.ts"]
}

{
  "include": ["src/**/*.ts"],
  "exclude": ["node_modules", "dist", "**/*.test.ts"]
}

{
  "include": ["src/**/*.ts"],
  // "exclude": ["node_modules", "dist"]  // Comment out to test
}

{
  "compilerOptions": {
    "explainFiles": true
  },
  "include": ["src/**/*.ts"]
}

npx tsc --explainFiles

# Output shows:
# - Files being included and why
# - Files being excluded and why
# - Configuration being used
# - Resolution details

# Example output:
# File '/project/src/index.ts':
#   Matched by include pattern '**/*' in 'tsconfig.json'
# File '/project/node_modules/typescript/lib/lib.es5.d.ts':
#   Library code file

npx tsc --traceResolution