This is not likely to stay here; it is probably better integrated
into some test or benchmarking utilities (like `dumpGraphToGraphviz`).

This is to allow truthy tests to pass when checking to see if
edges exist.

…ault edge type to 1

…nto bdo/buffer-backed-graph

…e in removeEdge

…raph

…raph

* bdo/buffer-backed-graph:
  Add generic TEdgeType to EfficientGraph
  change NullEdgeType back to 1, enforce edge types to be non-zero in Graph
  fix traversal test
  Use new EfficientGraph functions in Graph, update tests, fix edge type in removeEdge
  use EfficientGraph getNodes functions, update graph tests, change default edge type to 1

This adds `nodeAt` and `indexOfNode` utils to abstract away
the bookkeeping for storing and retrieving nodes in the byte array.

Also fixes a bug where subsequently added nodes would partially
overlap previous nodes in the byte array.

…nto bdo/buffer-backed-graph

Lots of test cases seem to expect this. I'm not sure if that is
intentional or not, but it seems reasonable to do this, regardless.

Also attempt to disambiguate some of the naming
for hash and index functions.

…undleGraph to use new functions

…raph

* bdo/buffer-backed-graph: (37 commits)
  Improve resolver performance (#6328)
  v2.0.0-beta.3.1
  Add it to the nightly release workflow as well
  Configure jemalloc page size for M1 (#6314)
  Update swc (#6307)
  Fix parcelDependencies
  v2.0.0-beta.3
  Update swc (#6289)
  Remove old AdjacencyList, serialize EfficientGraph in Graph, update BundleGraph to use new functions
  Babel ast location, diagnostic, and source location remapping (#6238)
  update contributing guide (#6293)
  Update sourcemap to rc-1.0 (#6279)
  Serve nearest index.html in case the applications has multiple index files (#6250)
  Allow bundling browserify bundles by replacing free requires with undefined (#6260)
  Upgrade flow to 0.151.0 (#6281)
  Use local require for `@babel/core` and `postcss` (#6264)
  Resolve helpers relative to JS transformer (#6278)
  Pure comment for $parcel$interopDefault (#6271)
  Don't transpile spread in JSX with modern targets (#6274)
  Update TS validator assertions (#6272)
  ...

…-edgetypes

# Conflicts:
#	packages/core/core/src/BundleGraph.js
#	packages/core/core/src/dumpGraphToGraphViz.js
#	yarn.lock

We resize the graph edges when the available capacity is <30%,
but we were indexing a new edge _before_ expanding capacity,
which was causing a loop when the the total capacity was too small
(i.e., `4`) to trigger the 30% threshold in a previous add _and_
there was no available capcity for the next add.

This could help us optimize our hash function.

Since these values are used in hashing, we serialize them
along with the edges and nodes to ensure that the hashes don't
change when a new graph is deserialized from a previous graph.

This addes a DELETED sentinel that preserves contiguity
in the hash table so that scanning forward to find edges
that match a hash continues to work after other edges with
a matching hash have been removed.

Not only is it unused, but it might not make any sense for it to exist,
given that adding a node is basically just incrementing a counter.

Also fix collision stat and add node/edge capacity and load stats

…-graph

This reverts commit 82bb175.

The common use case here is iterating over all the edges
to copy them to a new graph. Since a graph may have _a lot_
of edges, we can conserve memory by avoiding collecting all
edges up front.

…nsertion

These views are meant to simplify the bookkeeping operations
in AdjacencyList, though they may be introducing some slowdowns.

However, this should provide some optimization opportunity,
for example, caching/memoizing of computed values,
and also implementing a doubly linked edge list to improve
scan / iteration times.

This makes console logging a little more readable during debugging

We'll try to make AdjacencyList be responsible for all linking,
while Edge/Node are just responsible for reading/writing to/from
the node and edge arrays.

Aslo remove some old code

* v2: (34 commits)
  Wrap assets recursively when any incoming dependency is wrapped (#6572)
  Improvements for library targets (#6570)
  Diagnostic for undeclared external dependencies in library builds (#6564)
  More bugs (#6567)
  Don't require `url:` for image transformer (#6565)
  Remove 'Name already registered with serializer' error (#6566)
  Fix live bindings and `this` of external CommonJS modules (#6548)
  JS runtime improvements (#6531)
  Make sure the absolute path isn't contained in the cache (#5900)
  Adds '@parcel/diagnostic' to dependencies (#6563)
  Disable workers with string literals and improve diagnostics (#6536)
  Bug fixes (#6541)
  Don't attempt to resolve URLs starting with '#' (#6504)
  Correctly set worker's output format if not support by environment (#6534)
  Babel: Recognize peerDependencies in isJSX (#6497)
  fix setHeaders ordering on dev server (#6500)
  Graph: Remove Node interface (#6530)
  Fix TS build script for old Node versions (#6526)
  Improve library targets (#6517)
  Fix TypeScript and other sourcemaps by always creating an initial sourcemap (#6472)
  ...

This adds a lookup table by type to or from a given node,
so that it is trivial to frequently get a given node's
connected nodes of a given type.

The overhead associated with these two data structures
was not negligible, so a better choice is to use methods
on AdjacencyList instead of creating Edge and Node views.

This is a space optimization; there may be some performance impact
due to the extra time spent scanning the list when removing an edge.

It saves space by eliminating the need to explicitly store the
next and previous edges in each edge object. Instead, it maintains
an XOR of the next and previous edges on each edge, which means
following the links between edges requires knowing the edge that
came before or after.

They're all just getting immediately exhausted by Graph anyway.

XOR links are about 25% slower than the reference link implementation,
but use about 20-25% less space. The singly linked version is even
slower than XOR, but has the same space savings.

This commit restores a singly linked list, but adds a caching
mechanism for improving the perf when finding a previous edge.

…for an available slot to add an edge to

Each edge now has a pointer to the next edge in the list of collisions
indexFor will find an empty edge and update the last edge in the chain to point to the newly added edge
indexOf will now only traverse through the list of edges with the same hash

TODO:
* reuse deleted edges
* move NEXT_HASH pointer to another structure to save on memory
* the cellar gets exhausted pretty quickly, look into increasing the amount of space the cellar occupies

…that point to edges in the cellar

Also added a header sequence to the arrays, which eliminates
the need to serialize other data separately from the arrays.

We were reclaiming space when removing edges, but it turns out
that doing so was quite expensive in practice. Instead, we defer
reclaiming that space until the sum total of adds and deletes
exceeds the capacity by the load factor.

We don't need this any more because we eliminated linear scanning.

This is intended to strike a balance between growing the
edge capacity in too small increments, which causes a lot of
resizing, and growing the edge capacity in too large increments,
which results in a lot of wasted memory.

It turns out prepopulating the typemap before doing any traversal
slows down the graph building process significantly, but does not
make traversal any faster.

* v2: (42 commits)
  Remove dead link to docs in diagnostic (#6913)
  Fix engines.parcel in SVG packager (#6911)
  Use imported Readable flow type instead of global (#6910)
  Use non-deprecated SVGO options in HTMLNanoOptimizer (#6785)
  Use yarnpkg registry for all the things (#6908)
  Fix issue about loading configs from tsconfig.json (#6881)
  Add `@section` to Compressor type (#6885)
  Parcel API improvements (#6866)
  Use stream-browserify for polyfilling instead (#6863)
  Add support for compressor plugins (#6776)
  Support for inline style attributes and inline scripts in SVG (#6797)
  Bump less (#6852)
  Make sure (non-React) SVGs are in separate bundles (#6757)
  Add support for injecting manifest into service workers (#6798)
  Fix 'does not export default' error with scope hoisting and url/worklet pipeline (#6803)
  Remaining cargo clippy fixes (#6829)
  Lazily install sharp only when needed (#6816)
  More cargo clippy suggestions (#6811)
  Don't emit runtime manifest for inline child bundles (#6807)
  Apply suggestions from rust-clippy (#6256)
  ...

* bdo/number-edgetypes: (74 commits)
  Remove dead link to docs in diagnostic (#6913)
  Fix engines.parcel in SVG packager (#6911)
  Use imported Readable flow type instead of global (#6910)
  Use non-deprecated SVGO options in HTMLNanoOptimizer (#6785)
  Use yarnpkg registry for all the things (#6908)
  Fix issue about loading configs from tsconfig.json (#6881)
  Add `@section` to Compressor type (#6885)
  Parcel API improvements (#6866)
  Use stream-browserify for polyfilling instead (#6863)
  Add support for compressor plugins (#6776)
  Support for inline style attributes and inline scripts in SVG (#6797)
  Bump less (#6852)
  Make sure (non-React) SVGs are in separate bundles (#6757)
  Add support for injecting manifest into service workers (#6798)
  Fix 'does not export default' error with scope hoisting and url/worklet pipeline (#6803)
  Remaining cargo clippy fixes (#6829)
  Lazily install sharp only when needed (#6816)
  More cargo clippy suggestions (#6811)
  Don't emit runtime manifest for inline child bundles (#6807)
  Apply suggestions from rust-clippy (#6256)
  ...

This matches the naming of the corresponding methods on Graph.

It's benchmarking about 67% faster without any degradation in uniformity.

Also fixed some tests that were assuming some things about hashing.

* v2:
  Upgrade Flow to 0.160.1 (#6964)
  Only use error overlay if there's a document (#6960)
  Don't fail when HTML tags are implied (#6752)
  Reorder resolveOptions() env priority (#6904)
  Change edge types to numbers (#6126)
  Bump swc (#6848)
  Print diagnostics for scope hoisting bailouts at verbose log level (#6918)

This looks like a big change because a lot of stuff moved around.
The edges are currently stored the same way they were before,
but the hash table implementation has been extracted for use
in the new node map.

The node map is where the real change is; instead of just linking
nodes to addresses in the edge map, it now stores multiple sets
of links per node, one for each type of edge.

This allows us to eliminate the need for a type map cache,
as we are now able to look up edges by type in constant time.

* v2: (68 commits)
  Fix RangeError in `not export` error with other file type (#7295)
  Apply sourcemap in @parcel/transformer-typescript-tsc (#7287)
  Fix side effects glob matching (#7288)
  Fix changelog headings
  v2.0.1
  Changelog for v2.0.1
  Resolve GLSL relative to the importer, not the asset (#7263)
  fix: add @parcel/diagnostic as dependency of @parcel/transformer-typescript-types (#7248)
  Fixed missing "Parcel" export member in Module "@parcel/core" (#7250)
  Add script to sync engines with core version (#7207)
  Bump swc (#7216)
  Make Webpack loader detection regex dramatically faster (#7226)
  swc optimizer (#7212)
  Update esbuild in optimizer (#7233)
  Properly visit member expressions (#7228)
  Update to prettier 2 (#7209)
  Fix serve mode with target override and target source fields (#7187)
  Update package.json to include the repository (#7184)
  fix #6730: add transformer-raw as dependency of config-webextension (#7193)
  Log warning instead of crash if image optimizer fails (#7119)
  ...