Starting with npm 6.4.0 you can use the --preid option of npm version like this:
$ npm version prerelease --preid=alpha
v0.1.1-alpha.0
$ npm version prerelease --preid=alpha
v0.1.1-alpha.1
$ npm version prerelease --preid=alpha
v0.1.1-alpha.2
Starting with npm 6.4.0 you can use the --preid option of npm version like this:
$ npm version prerelease --preid=alpha
v0.1.1-alpha.0
$ npm version prerelease --preid=alpha
v0.1.1-alpha.1
$ npm version prerelease --preid=alpha
v0.1.1-alpha.2
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