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For fields with primitive values, any user-provided\n * value will override the corresponding default value. For fields with\n * non-primitive values (like `spanLimits`), the user-provided value will be\n * used to extend the default value.\n */\n\n// object needs to be wrapped in this function and called when needed otherwise\n// envs are parsed before tests are ran - causes tests using these envs to fail\nexport function loadDefaultConfig() {\n  return {\n    sampler: buildSamplerFromEnv(),\n    forceFlushTimeoutMillis: 30000,\n    generalLimits: {\n      attributeValueLengthLimit:\n        getNumberFromEnv('OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT') ?? Infinity,\n      attributeCountLimit:\n        getNumberFromEnv('OTEL_ATTRIBUTE_COUNT_LIMIT') ?? 128,\n    },\n    spanLimits: {\n      attributeValueLengthLimit:\n        getNumberFromEnv('OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT') ?? Infinity,\n      attributeCountLimit:\n        getNumberFromEnv('OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT') ?? 128,\n      linkCountLimit: getNumberFromEnv('OTEL_SPAN_LINK_COUNT_LIMIT') ?? 128,\n      eventCountLimit: getNumberFromEnv('OTEL_SPAN_EVENT_COUNT_LIMIT') ?? 128,\n      attributePerEventCountLimit:\n        getNumberFromEnv('OTEL_SPAN_ATTRIBUTE_PER_EVENT_COUNT_LIMIT') ?? 128,\n      attributePerLinkCountLimit:\n        getNumberFromEnv('OTEL_SPAN_ATTRIBUTE_PER_LINK_COUNT_LIMIT') ?? 128,\n    },\n  };\n}\n\n/**\n * Based on environment, builds a sampler, complies with specification.\n */\nexport function buildSamplerFromEnv(): Sampler {\n  const sampler =\n    getStringFromEnv('OTEL_TRACES_SAMPLER') ??\n    TracesSamplerValues.ParentBasedAlwaysOn;\n  switch (sampler) {\n    case TracesSamplerValues.AlwaysOn:\n      return new AlwaysOnSampler();\n    case TracesSamplerValues.AlwaysOff:\n      return new AlwaysOffSampler();\n    case TracesSamplerValues.ParentBasedAlwaysOn:\n      return new ParentBasedSampler({\n        root: new AlwaysOnSampler(),\n      });\n    case TracesSamplerValues.ParentBasedAlwaysOff:\n      return new ParentBasedSampler({\n        root: new AlwaysOffSampler(),\n      });\n    case TracesSamplerValues.TraceIdRatio:\n      return new TraceIdRatioBasedSampler(getSamplerProbabilityFromEnv());\n    case TracesSamplerValues.ParentBasedTraceIdRatio:\n      return new ParentBasedSampler({\n        root: new TraceIdRatioBasedSampler(getSamplerProbabilityFromEnv()),\n      });\n    default:\n      diag.error(\n        `OTEL_TRACES_SAMPLER value \"${sampler}\" invalid, defaulting to \"${TracesSamplerValues.ParentBasedAlwaysOn}\".`\n      );\n      return new ParentBasedSampler({\n        root: new AlwaysOnSampler(),\n      });\n  }\n}\n\nfunction getSamplerProbabilityFromEnv(): number | undefined {\n  const probability = getNumberFromEnv('OTEL_TRACES_SAMPLER_ARG');\n  if (probability == null) {\n    diag.error(\n      `OTEL_TRACES_SAMPLER_ARG is blank, defaulting to ${DEFAULT_RATIO}.`\n    );\n    return DEFAULT_RATIO;\n  }\n\n  if (probability < 0 || probability > 1) {\n    diag.error(\n      `OTEL_TRACES_SAMPLER_ARG=${probability} was given, but it is out of range ([0..1]), defaulting to ${DEFAULT_RATIO}.`\n    );\n    return DEFAULT_RATIO;\n  }\n\n  return probability;\n}\n"]}