Support "main" index file for non-module environments and flat import

[james2doyle]

Closes #462. Closes #471.

Implements "main" which is required when your primary export file is not <root>/index.js. See https://docs.npmjs.com/cli/v7/configuring-npm/package-json#main

[typicode]

Thanks for the PR :+1: I'd rather keep lowdb a pure ESM package.

[james2doyle]

That's disappointing. This one line fixes most people's problems with this working in other environments. This is just a config change. No code updates required.

On Sun., Jun. 6, 2021, 6:26 p.m. typicode, @.***> wrote:

Closed #475 https://github.com/typicode/lowdb/pull/475.

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[typicode]

Sorry. That said, I'm not sure having just main is sufficient (at least just changing that wasn't enough in my tests).

$ npm init -y
$ npm i lowdb
$ echo "require('lowdb')" > index.js

# edit node_modules/lowdb/package.json
# and add "main": ""main": "./lib/index.js"

$ node index.js
node:internal/modules/cjs/loader:1126
      throw new ERR_REQUIRE_ESM(filename, parentPath, packageJsonPath);
      ^

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /tmp/foo/node_modules/lowdb/lib/index.js
require() of ES modules is not supported.

[james2doyle]

It still won't support node without experimental modules enabled. But it will work properly in typescript or when using babel to compile the modules since it knows where to find the main index file

On Sun., Jun. 6, 2021, 7:09 p.m. typicode, @.***> wrote:

Sorry. That said, I'm not sure having just main is sufficient (at least just changing that wasn't enough in my tests).

$ npm init -y $ npm i lowdb $ echo "require('lowdb')" > index.js

edit node_modules/lowdb/package.json# and add "main": ""main": "./lib/index.js"

$ node index.js node:internal/modules/cjs/loader:1126 throw new ERR_REQUIRE_ESM(filename, parentPath, packageJsonPath); ^

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /tmp/foo/node_modules/lowdb/lib/index.jsrequire() of ES modules is not supported.

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