dotenv-constraint/dist/index.mjs

A lightweight package to enforce constraints on environment variables in JavaScript, ensuring required variables are defined and match expected types.

// src/index.ts
import fs from "fs";
import path from "path";
var validateEnv = (config) => {
  var _a, _b;
  const appRoot = process.cwd();
  let envFile;
  let envSchemaFile;
  try {
    envFile = fs.readFileSync(
      path.join(appRoot, (_a = config == null ? void 0 : config.dotenvPath) != null ? _a : ".env"),
      "utf8"
    );
    envSchemaFile = fs.readFileSync(
      path.join(appRoot, (_b = config == null ? void 0 : config.schemaPath) != null ? _b : ".env.schema"),
      "utf8"
    );
  } catch (error) {
    return {
      errors: [
        {
          code: "file_not_found"
        }
      ],
      success: false
    };
  }
  const envVariables = extractEnvVariables(envFile);
  const envSchema = extractEnvSchema(envSchemaFile);
  const result = checkConstraints(envVariables, envSchema);
  return {
    errors: result,
    success: result.length === 0
  };
};
var extractEnvVariables = (dotenvFile) => {
  const envVariables = [];
  for (const line of dotenvFile.split("\n")) {
    if (line.includes("=")) {
      const [name, value] = line.split("=");
      envVariables.push({ name, value });
    }
  }
  return envVariables;
};
var extractEnvSchema = (schemaFile) => {
  const schema = [];
  for (const line of schemaFile.split("\n")) {
    if (line.includes("=")) {
      const name = line.split("=")[0];
      const optional = line.includes("#optional");
      const number = line.includes("#number");
      schema.push({ name, constraints: { optional, number } });
    }
  }
  return schema;
};
var checkConstraints = (envVariables, envSchema) => {
  const errors = [];
  for (const { name, constraints } of envSchema) {
    const envVariable = envVariables.find((v) => v.name === name);
    if (!envVariable && !constraints.optional) {
      errors.push({
        variable: name,
        code: "missing"
      });
    } else if (envVariable) {
      if (constraints.number) {
        const result = isNumber(envVariable);
        if (result !== true) {
          errors.push(result);
        }
      }
      if (!constraints.optional) {
        const result = isRequired(envVariable);
        if (result !== true) {
          errors.push(result);
        }
      }
    }
  }
  return errors;
};
var isRequired = (envVariable) => {
  if (!envVariable.value) {
    return {
      variable: envVariable.name,
      code: "empty"
    };
  }
  return true;
};
var isNumber = (envVariable) => {
  if (envVariable.value && isNaN(Number(envVariable.value))) {
    return {
      variable: envVariable.name,
      code: "invalid_type",
      expected: "number"
    };
  }
  return true;
};
var index_default = {
  validateEnv
};
export {
  index_default as default,
  validateEnv
};
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