Update dependency prettier to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
prettier (source)	devDependencies	major	^1.19.1 -> ^2.0.0

---

Release Notes

prettier/prettier

v2.0.2

Compare Source

diff

2.0 regressions

JavaScript: Fix formatting of pseudo-elements and pseudo-classes in styled-components template literals (#​7842 by @​thorn0)

// Input
const Foo = styled.div`
  ${media.smallDown}::before {}
`;

// Prettier 2.0.0
const Foo = styled.div`
  ${media.smallDown}: : before{
  }
`;

// Prettier 2.0.2
const Foo = styled.div`
  ${media.smallDown}::before {
  }
`;

TypeScript: Avoid trailing commas on index signatures with only one parameter (#​7836 by @​bakkot)

TypeScript index signatures technically allow multiple parameters and trailing commas, but it's an error to have multiple parameters there, and Babel's TypeScript parser does not accept them. So Prettier now avoids putting a trailing comma there when you have only one parameter.

// Input
export type A = {
  a?: {
    [
      x: string
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

// Prettier 2.0.0
export type A = {
  a?: {
    [
      x: string,
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

// Prettier 2.0.2
export type A = {
  a?: {
    [
      x: string
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

Revert "markdown: fix redundant leading spaces in markdown list" (#​7847)

See #​7846

Other changes

TypeScript: Fix prettier-ignore in union types (#​7798 by @​thorn0)

// Input
export type a =
  // foo
  | foo1&foo2
  // prettier-ignore
  | bar1&bar2
  // baz
  | baz1&baz2;

// Prettier 2.0.0
export type a =
  // foo
  | foo1&foo2
    // prettier-ignore
  // prettier-ignore
  | (bar1 & bar2)
  // baz
  | (baz1 & baz2);

// Prettier 2.0.2
export type a =
  // foo
  | (foo1 & foo2)
  // prettier-ignore
  | bar1&bar2
  // baz
  | (baz1 & baz2);

v2.0.1

Compare Source

diff

API: Fix build script to not corrupt import-fresh module (#​7820 by @​thorn0)

v2.0.0

Compare Source

diff

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[edmorley]

Tests failing since they dropped support for Node 8.

[edmorley]

Blocked on #255.

[renovate]

PR has been edited

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[edmorley]

I've worked around Prettier dropping Node 8 support by adjusting the Travis matrix, such that linting does not run under Node 8, and that the yarn install also uses --ignore-engines.

This will allow us to upgrade now and put off dropping Node 8 for a bit longer, for the reasons in #255 (comment).