Remove extra = in sharedb-legacy devDependency

[ericyhwang]

In the latest Node 18.17.1 with NPM 6, sharedb fails to install with an "Invalid URL" error.

I traced it back to an attempted parsing of "npm:sharedb@=1.1.0", which is the specifier for the sharedb-legacy devDependency.

According to node-semver:

A leading "=" or "v" character is stripped off and ignored.

It seems something in the combination of latest Node 18 with NPM 6 isn't stripping the =.

Node 18 by default comes with NPM 9, which is why sharedb's CI didn't break. However, NPM 6 is still supported since NPM 7 made some notable breaking changes, and the = somehow breaks things even when sharedb is installed as a dependency.

Since the = is meaningless in the specifier, removing it fixes the issue and shouldn't affect anything.

Click to see full NPM stack trace

5579 verbose stack TypeError [ERR_INVALID_URL]: Invalid URL
5579 verbose stack     at new NodeError (node:internal/errors:405:5)
5579 verbose stack     at Url.parse (node:url:445:17)
5579 verbose stack     at Object.urlParse [as parse] (node:url:167:13)
5579 verbose stack     at fixupUnqualifiedGist (/usr/local/lib/node_modules/npm/node_modules/hosted-git-info/index.js:99:20)
5579 verbose stack     at fromUrl (/usr/local/lib/node_modules/npm/node_modules/hosted-git-info/index.js:40:13)
5579 verbose stack     at module.exports.fromUrl (/usr/local/lib/node_modules/npm/node_modules/hosted-git-info/index.js:32:18)
5579 verbose stack     at Object.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/normalize-package-data/lib/fixer.js:150:36)
5579 verbose stack     at Array.forEach (<anonymous>)
5579 verbose stack     at Object.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/normalize-package-data/lib/fixer.js:144:31)
5579 verbose stack     at Array.forEach (<anonymous>)
5579 verbose stack     at Object.fixDependencies (/usr/local/lib/node_modules/npm/node_modules/normalize-package-data/lib/fixer.js:137:41)
5579 verbose stack     at /usr/local/lib/node_modules/npm/node_modules/normalize-package-data/lib/normalize.js:32:38
5579 verbose stack     at Array.forEach (<anonymous>)
5579 verbose stack     at normalize (/usr/local/lib/node_modules/npm/node_modules/normalize-package-data/lib/normalize.js:31:15)
5579 verbose stack     at new Manifest (/usr/local/lib/node_modules/npm/node_modules/pacote/lib/finalize-manifest.js:116:3)
5579 verbose stack     at /usr/local/lib/node_modules/npm/node_modules/pacote/lib/finalize-manifest.js:52:13

[coveralls]

coverage: 97.512%. remained the same when pulling 6231ca6 on fix-sharedb-legacy-spec into a575e6a on master.

[ericyhwang]

In addition to publishing this onto the current v4, I've also cherry-picked this onto v2 and v3 and published them:

• 2.2.6
• 3.3.2