Function booleanFromEnv

booleanFromEnv(
defaultValue: boolean,
): ZodDefault<
ZodUnion<[ZodBoolean, ZodEffects<ZodString, boolean, string>]>,
>
Zod schema for boolean environment variables.

Accepts both native booleans (from config files) and string values from process.env. Only "true" (case-insensitive) maps to true, everything else maps to false.
Parameters
- defaultValue: boolean
  Default value when the env var is not set
Returns ZodDefault<ZodUnion<[ZodBoolean, ZodEffects<ZodString, boolean, string>]>>
Zod schema that outputs a boolean
Example
```
// In env schema:
OTEL_ENABLED: booleanFromEnv(false),
MCP_LEGACY_SSE_ENABLED: booleanFromEnv(false),
```
- Defined in src/utils/zod-helpers.ts:38