fix #4223, add interpolation config.

[alfa-jpn]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

Sorry for create pr before approval...

This PR perfectly fix #4223.

Usage

Vue.config.interpolation = false // default is true.

Best regards,

[HerringtonDarkholme]

Hi @alfa-jpn, thanks for your contribution.

However, there is no silver bullet for server side vue template, especially when users want to mix user generated content with programmer's template. IMHO, Vue's users can and should think over how to separate UGC and template.

On the other hand, Vue's API is already large enough. Vue.config.interpolation can be easily replaced by v-pre that already exists. Users can even provide non-matching regex to mock this pull request.

While we thank your contribution, we might still keep our API surface not too large. (Vue's API is already not as small as it used to be). For more reasoning, please see #6004 (comment).

[alfa-jpn]

@HerringtonDarkholme
Tanks for reply.

I see.
I also agree with a policy of minimum API.

But, the non-matching regex is weak to version up, because it's implemented by a mocking replace method of string.
(please see #4223 (comment) about v-pre )

So, I created plugin.
https://github.com/alfa-jpn/vue-disable-interpolation